Chronograph - Watch

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A chronograph is a timepiece or watch with both timekeeping and stopwatch functions. Pocket watch chronographs were produced as early as the 18th century but did not become popular until the 1820s. The term 'Chronograph' is often confused with the term 'Chronometer' which in some cases designates a watch that has received a precision certification. The Marine chronometer was an accurate timepiece used to enable celestial navigation.
There are many types of chronographs.
* Digital chronographs use a digital display for both timekeeping and stopwatch functions, either with separate displays or by switching modes on a single display.
* Analog-digital chronographs have a standard analog watch with permanent center seconds and a separate digital display that usually operates independently of the analog section. A fallback will reset to zero and then continue to run when the reset button is pushed while the stopwatch is running. In contrast, most mechanical chronographs will reset to zero only when the stopwatch is stopped.

Tourbillon - watches

Tourbillon watches for men
A Tourbillon or Tourbillion is an addition to the mechanics of a watch escapement. Invented in 1795 by Swiss watchmaker Abraham-Louis Breguet, a tourbillon counters the effects of gravity by mounting the escapement and balance wheel in a rotating cage, ostensibly in order to negate the effect of gravity when the timepiece (and thus the escapement) is rotated. Originally an attempt to improve accuracy, tourbillons are still included in some expensive modern watches as a novelty and demonstration of watchmaking virtuosity. The mechanism is usually exposed on the watch's face to show it off.

Modern tourbillon watches
In modern mechanical watch designs, a tourbillon is not required to produce a highly accurate timepiece; there is even debate amongst horologists as to whether tourbillons ever improved the accuracy of mechanical time pieces, even when they were first introduced, or whether the time pieces of the day were inherently inaccurate due to design and manufacturing techniques.
Nevertheless, the tourbillon is one of the most valued features of collectors' watches and premium timepieces (Ref. August 2006 WatchTime article Girard-Perregaux's Tourbillon Icon), possibly for the same reason that mechanical watches fetch a much higher price than similar quartz watches that are much more accurate. High-quality tourbillon wristwatches, which are usually made by the Swiss luxury watch industry, are very expensive, and typically retail for at least thousands of dollars or euros, with much higher prices in the tens of thousands of dollars/euros being common.
A recent renaissance of interest in tourbillons has been met by the industry with increased availability of time pieces bearing the feature, with the result that prices for basic tourbillon models have receded somewhat in recent years (where as previously they were very rare, in either antiques or new merchandise); however, any time piece that has a tourbillon will cost a great deal more than an equivalent piece without the feature.

Modern implementations typically allow the tourbillon to be seen through a window in the watch face. In addition to enhancing the charm of the piece, the tourbillon can act as a second hand for some watches as it generally rotates once per minute.
However some Tourbillons spin faster (Gruebel Forsey's 24-second tourbillon for example.). There are many "Tourbillon" fake/replicas of premium brand watches that emulate this feature with the oscillating balance wheel visible through the watch dial; however, these are not tourbillons.
In the late 20th century, the first research into multi-axis tourbillion movements was done by British clockmakers Anthony Randall and Richard Good, eventually producing two- and three-axis tourbillon movements.

Double Axis Tourbillon
Inspired by these genius clockmakers the young german watchmaker Thomas Prescher developed for the Thomas Prescher Haute Horlogerie in 2003 the first flying Double Axis Tourbillon in a pocketwatch and in 2004 the first flying Double Axis Tourbillon with constant force in the carriage in a wristwatch. Shown at the Baselworld 2003 and 2004 in Basel, Switzerland.
A characteristic of this tourbillon is that it is turning around 2 axes. The first axis and the second axis are both turning once per minute. The whole tourbillon is powered by a special constant force mechanism, called Remontoire[2]. Thomas Prescher invented the constant force mechanism in the carriage for the necessary power in the Double Axis Tourbillon. He has chosen the mechanism to equalize the different forces caused by wound and unwound mainspring, friction, and gravitation effects. So that even force is always supplied to the oscillation regulating system of the Double Axis Tourbillon.

Triple Axis Tourbillon
Thomas Prescher developed for the Thomas Prescher Haute Horlogerie in 2004 the first Triple Axis Tourbillon with constant force in the carriage in a wristwatch. Presented at the Baselworld 2004 in Basel, Switzerland in a Set of three watches. A Single Axis Tourbillon, a Double Axis Tourbillon and a Triple Axis Tourbillon.
Characteristic for this technical high-end complication is that the tourbillon is turning around 3 axes. The first axis and the second axis both complete one rotation every minute and the third axis is turning once every hour. The Triple Axis Tourbillon is powered, same as the Double Axis Tourbillon, by a special constant force mechanism, called Remontoire.

Shock Resistant watch

Men Watches > Shock Resistant watch
Shock resistant is a common mark stamped on the back of wrist watches to indicate how well a watch copes with shocks.
The International Organization for Standardization issued a standard for shock resistant watches, which many countries have adopted. ISO 1413 Horology—Shock-resistant watches specifies the minimum requirements and describes the corresponding method of test. It is intended to allow homologation tests rather than the individual control of all watches of a production of a production batch. It is based on the simulation of the shock received by a watch on falling accidentally from a height of 1 m on to a horizontal hardwood surface.

In practice shock resistance is generally tested by applying two shocks (one on the 9 o'clock side, and one to the crystal and perpendicular to the face). The shock is usually delivered by a hard plastic hammer mounted as a pendulum, so as to deliver a measured amount of energy, specifically, a 3 kg hammer with an impact velocity of 4.43 m/s. The watch must keep its accuracy to +/- 60 seconds/day as measured before the test.

Chronometer - Watches

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Chronometer watch is a watch tested and certified to meet certain precision standards. In Switzerland, only timepieces certified by the COSC may use the word 'Chronometer' on them.
However, numerous prominent Swiss watch manufacturers do not submit their movements for COSC certification, although such movements would probably easily qualify as chronometers under the COSC certification rules, e.g. nowadays, some of the ″Haute Horlogerie″ Swiss Watch Manufacturers have created on 5 June 2001, ″The Fleurier Quality Foundation″ to establish new aesthetic and technical criteria dedicated to the certification of finished watches. Their certification meets a normative requirement for the market and the final customer to have a better definition of quality watchmaking, adapted to today's demands and technological advances.

The term chronometer is also used to describe a marine chronometer used for celestial navigation. The marine chronometer was invented by John Harrison in 1730. This was the first of a series of chronometers which enabled accurate marine navigation. For the next 250 years, an accurate chronometer was essential to any kind of marine or air navigation until the implementation of global satellite navigation at the end of the 20th century. The marine chronometer is no longer used for navigation.

Chronometers often included other innovations to increase their efficiency and precision. Hard stones such as diamond, ruby, and sapphire were often used as jewel bearings to decrease friction and wear of the pivots and escapement. Chronometer makers also took advantage of the physical properties of rare metals such as gold, platinum, and palladium.
Complications
In horology terms, a complication in a mechanical watch is a special feature that causes the design of the watch movement to become more complicated. Examples of complications include:
* Tourbillon
* Perpetual Calendar
* Minute repeater
* Equation of time
* Power reserve
* Moon phases

SPACE MISSIONS Watches - Astronauts Watches

Astronauts Watches
FLIGHT-CERTIFIED BY NASA FOR ALL MANNED SPACE MISSIONS:
* Omega Speedmaster Professional 3570.50.00
FLIGHT-QUALIFIED BY NASA FOR SPACE MISSIONS:
* Omega Speedmaster Professional X-33
* Casio G-Shock DW-5600C
* Casio G-Shock DW-5600E
* Casio G-Shock DW-5900
* Casio G-Shock DW-6900
* Casio G-Shock Master of G G-9000
* Timex IRONMAN Triathlon Data Link

Omega Speedmaster
The Omega Speedmaster Professional, otherwise known as the "Moonwatch", is a manual winding chronograph introduced in 1957 and made famous by its selection by NASA for the Apollo Program. The Omega Speedmaster was the first watch worn on the moon, as Buzz Aldrin wore his Speedmaster 145.012 fitted with the Omega 321 caliber on 20 July 1969. (Neil Armstrong left his Speedmaster inside the landing module "Eagle" during his famous first walk). It is the only watch flight-qualified for EVA use by NASA. It is also the watch chosen for use in outer space by the Russian space agency NPO Energia.

Casio G-Shock Master of G
The Master of G series were a collection of G-Shock watches produced by Japanese electronics and wristwatch manufacturer Casio in the late 1990s. There were several models in the range, of which many were designed to showcase a new form of technology that Casio had introduced into the G-Shock range, such as the Tough Solar power source and a digital compass.
Three of the current Masters of G have been included in a new collection launched on February 2009, the Men In Rusty Black (MIRB) series. The watches under this theme, which include the Riseman (GW-9200MS), the Frogman (GW-200MS) and the Mudman (G-9000MS), are said to feature a military-inspired look.
Timex, Astronauts Watches
Timex Datalink or Timex Data Link is a line of watches manufactured by Timex. As the name implies datalink watches are capable of data transfer through linking with a computer. The Datalink line was introduced in 1994 and it was co-developed with Microsoft as a wearable alternative to mainstream PDAs with additional attributes such as water resistance, that PDAs lacked, and easy programmability. The early models included models 50, 70, 150 and model 150s (small size). The model numbers indicated the approximate number of phone numbers that could be stored in the watch memory. These early models were, at the time of their introduction, the only watches to bear the Microsoft logo.
The watches have been certified by NASA for space travel and have been used by astronauts and cosmonauts in space missions. There has been an evolution over the years as to the number and type of entries that can be stored in the various watch models as well as the mode of data transfer between computer and watch.

Watches For scuba diving (dive) - water resistant watches

Scuba Diving Watches For Men
Watches may be crafted to become water resistant. These watches are sometimes called diving watches when they are suitable for scuba diving or saturation diving. The International Organization for Standardization issued a standard for water resistant watches which also prohibits the term "waterproof" to be used with watches, which many countries have adopted. Water resistance is achieved by the gaskets which form a watertight seal, used in conjunction with a sealant applied on the case to help keep water out. The material of the case must also be tested in order to pass as water resistant.

The watches are tested in theoretical depths, thus a watch with a 50 meter rating will be water resistant if it is stationary and under 50 meters of still water for a set amount of time. The most commonly used method for testing the water resistance is by depressurizing a small chamber containing the watch. A sensor measures the movement of the case and crystal to gauge how much pressure the watch is losing and how fast.
The watch never touches water in this type of machine. Another type of machine is used for very deep measure tests, where the watch is immersed in a small container filled with water, this chamber is then submitted to the pressure the watch is supposed to withstand. In neither case is there any variation in the pressure, nor is the watch submitted to that pressure for an extended period of time(normally only a couple of minutes). These are the only logical ways to test the water resistance of a watch, since adding variations added by time spent underwater or the movement of the wearers hands would simply make this a very intricate and difficult measurement. Although confusing this is the best way of telling the customer what to expect.

Zero gravity - Space Watches

Space Watches
Zero gravity environment and other extreme conditions encountered by astronauts in space requires the use of specially tested watches. On April 12, 1961, Yuri Gagarin wore a Shturmanskie (Штурманские > navigator's) wristwatch during his historic first flight into space. The Shturmanskie was manufactured at the First Moscow Factory.

Since 1964, the watches of the First Moscow Factory have been marked by the trademark "ПОЛЕТ", transliterated as "POLJOT", which means "flight" in Russian and is a tribute to the many space trips its watches have accomplished. In the late 1970s, Poljot launched a new chrono movement, the 3133. With a 23 jewel movement and manual winding (43 hours), it was a modified Russian version of the Swiss Valjoux 7734 of the early 1970s. Poljot 3133 were taken into space by astronauts from Russia, France, Germany and Ukraine. On the arm of Valeriy Polyakov, a Poljot 3133 chronograph movement-based watch set a space record for the longest space flight in history.

During the 1960s, a large range of watches were tested for durability and precision under extreme temperature changes and vibrations. The Omega Speedmaster Professional was selected by U.S. space agencies. (For a list of NASA-certified watches, see this footnote).

TAG Heuer became the first Swiss watch in space thanks to an Heuer Stopwatch, worn by John Glenn in 1962 when he piloted the Friendship 7 on the first manned U.S. orbital mission. (The company was then called "Heuer"; TAG had not yet been formed.)

The Breitling Navitimer Cosmonaute was designed with a 24-hour analog dial to avoid confusion between AM and PM, which are meaningless in space. It was first worn in space by U.S. astronaut Scott Carpenter on May 24, 1962 in the Aurora 7 mercury capsule.

Since 1994 Fortis is the exclusive supplier for manned space missions authorized by the Russian Federal Space Agency.
China National Space Administration (CNSA) astronauts wear the Fiyta spacewatches.
At BaselWorld, 2008, Seiko announced the creation of the first watch ever designed specifically for a space walk, Spring Drive Spacewalk.

Multi function watches

Multi function watches Many computerized wristwatches have been developed, but none have had long-term sales success, because they have awkward user interfaces due to the tiny screens and buttons, and a short battery life. As miniaturized electronics became cheaper, watches have been developed containing calculators, tonometers, barometers, altimeters, video games, digital cameras, keydrives, GPS receivers and cellular phones. In the early 1980s Seiko marketed a watch with a television in it. Such watches have also had the reputation as unsightly and thus mainly geek toys. Several companies have however attempted to develop a computer contained in a wristwatch (see also wearable computer).

Digital Watch

digital watches for men

The first digital watch, a Pulsar LED prototype in 1970, was developed jointly by Hamilton Watch Company and Electro-Data. John Bergey, the head of Hamilton's Pulsar division, said that he was inspired to make a digital timepiece by the then-futuristic digital clock that Hamilton themselves made for the 1968 science fiction film 2001: A Space Odyssey. On April 4, 1972, the Pulsar was finally ready, made in 18-carat gold and sold for $2,100. It had a red light-emitting diode (LED) display.
Since the advent of electronic watches that incorporate small computers, digital displays have also been available. A digital display simply shows the time as a number, e.g., 12:08 instead of a short hand pointing towards the number 12 and a long hand 8/60 of the way round the dial. The digital display watch was the newest way to tell time in 500 years.

Digital LED watches were very expensive and out of reach to the common consumer until 1975, when Texas Instruments started to mass produce LED watches inside a plastic case. These watches, which first retailed for only $20, reduced to $10 in 1976, saw Pulsar lose $6 million and the Pulsar brand sold to Seiko.

Most watches with LED displays required that the user press a button to see the time displayed for a few seconds, because LEDs used so much power that they could not be kept operating continuously. Usually the LED display color would be red. Watches with LED displays were popular for a few years, but soon the LED displays were superseded by liquid crystal displays (LCDs), which used less battery power and were much more convenient in use, with the display always visible and no need to push a button before seeing the time. The first LCD watch with a six-digit LCD was the 1973 Seiko 06LC, although various forms of early LCD watches with a four-digit display were marketed as early as 1972 including the 1972 Gruen Teletime LCD Watch, and the Cox Electronic Systems Quarza.

Analog Watch

Analog Watch Display
Traditionally, watches have displayed the time in analog form, with a numbered dial upon which are mounted at least a rotating hour hand and a longer, rotating minute hand. Many watches also incorporate a third hand that shows the current second of the current minute. Watches powered by quartz usually have a second hand that snaps every second to the next marker.
Watches powered by a mechanical movement have a "sweep second hand", the name deriving from its uninterrupted smooth (sweeping) movement across the markers, although this is actually a misnomer; the hand merely moves in smaller steps, typically 1/5th of a second, corresponding to the beat (half period) of the balance wheel. In some escapements (for example the duplex escapement), the hand advances every two beats (full period) of the balance wheel, typically 1/2 second in those watches, or even every four beats (two periods, 1 second), in the double duplex escapement. All of the hands are normally mechanical, physically rotating on the dial, although a few watches have been produced with “hands” that are simulated by a liquid-crystal display.

Analog display of the time is nearly universal in watches sold as jewelry or collectibles, and in these watches, the range of different styles of hands, numbers, and other aspects of the analogue dial is very broad. In watches sold for timekeeping, analog display remains very popular, as many people find it easier to read than digital display; but in timekeeping watches the emphasis is on clarity and accurate reading of the time under all conditions (clearly marked digits, easily visible hands, large watch faces, etc.). They are specifically designed for the left wrist with the stem (the knob used for changing the time) on the right side of the watch; this makes it easy to change the time without removing the watch from the hand. This is the case if one is right-handed and the watch is worn on the left wrist (as is traditionally done). If one is left-handed and wears the watch on the right wrist, one has to remove the watch from the wrist to reset the time or to wind the watch.

Analog watches as well as clocks are often marketed showing a display time of approximately 10:09 or 10:10. This creates a visually pleasing smile-like face on upper half of the watch. Digital displays often show a time of 12:38, where the increases in the numbers from left to right culminating in the fully-lit numerical display of the 8 also gives a positive feeling.

Automatic quartz - Watches

Automatic Watches For MEN :
Automatic quartz is a collective term describing watch movements that combine a self-winding rotor mechanism (as used in automatic mechanical watches) to generate electricity with a piezoelectric quartz crystal as its timing element. Such movements aim to provide the advantages of quartz without the environmental impact of batteries. Several manufacturers employ this technique.

A rotating pendulum inside the case is attached to a relatively large gear which meshes with a very small pinion. As the wearer moves, the pendulum turns and spins the pinion at a very high speed - up to 100,000 rpm. This is coupled to a miniature electrical generator which charges a storage device which is a capacitor(s) or a rechargeable battery. A typical full charge will last between two weeks and six months.

Japanese company Seiko pioneered the technique which it unveiled at the Baselworld 1986 under the trial name AGM. The first such watch was released in Germany in January 1988 and April of the same year in Japan (under the name Auto-Quartz). The watches had an average monthly rate of ±15 sec and provided 75 hours of continuous operation when fully powered. Early automatic quartz movements were called AGS (Automatic Generating System); in 1991 the company introduced the Kinetic brand name. Today Seiko offers a wide range of watches with various different Kinetic movements.

Autoquartz
Swiss company ETA SA, part of the Swatch group, made seven different automatic quartz movements, calling them Autoquartz. They were part of the premium Flatline series of movements and were sold to a variety of watch vendors, primarily European and American. High grade movements designed to last as long as their premium mechanical movements, they had between 15 to 53 jewels. Unlike most quartz watches, Autoquartz could be calibrated to increase their accuracy. Several vendors had their Autoquartz watches COSC certified. In 2006 to increase production of its highly demanded mechanical movements, Swatch discontinued supplying the Autoquartz line to customers (service and parts are still available). Then in 2009, possibly due to available production capacity or stocked parts, Tissot reintroduced the Autoquartz in its PRC200 dive watch. The Autoquartz movement used by Tissot is gold plated and carries the designation ETA 205.914.
Eco-Drive - Citizen
Citizen, the second largest Japanese watch company (after Seiko), also built an autoquartz-powered watch: the Citizen Promaster Eco-Duo Drive (released in December of 1998). Novel to this watch was the use of both mechanical power as well as a solar cell. This model was an attempt to enter higher-priced markets but the technology failed to attract consumer interest and Citizen has since stopped making use of the unique movement. No other autoquartz powered watch from Citizen is known, all other Eco-Drive models only use solar power or thermal power.
Ventura was a small Swiss watch manufacturer claiming to be "the World's only manufacturer of automatic digital watches". Their VEN_99 movement was the only watch to ever combine autoquartz and digital readout of time (LCD) in one package. Offered were three models: the Sparc rx, fx and px. In late 2006, the company started selling their movement with an incorporated alarm, another exclusive feature. All hardware was proprietary to Ventura. In 2007 the company went into bankruptcy.

Automatic-watch

The Automatic watch, A self-winding or automatic mechanism is one that rewinds the mainspring of a mechanical movement by the natural motions of the wearer's body. The first self-winding mechanism, for pocketwatches, was invented in 1770 by Abraham-Louis Perrelet; but the first "self-winding," or "automatic," wristwatch was the invention of a British watch repairer named John Harwood in 1923. This type of watch allows for a constant winding without special action from the wearer: it works by an eccentric weight, called a winding rotor, which rotates with the movement of the wearer's wrist.
The back-and-forth motion of the winding rotor couples to a ratchet to automatically wind the mainspring. Self winding watches usually can also be wound manually so they can be kept running when not worn, or if the wearer's wrist motions don't keep the watch wound.

Some electronic watches are also powered by the movement of the wearer of the watch. Kinetic powered quartz watches make use of the motion of the wearer's arm turning a rotating weight, which turns a generator to supply power to charge a rechargeable battery that runs the watch. The concept is similar to that of self-winding spring movements, except that electrical power is generated instead of mechanical spring tension.

Electronic watches require electricity as a power source. Some mechanical movements and hybrid electronic-mechanical movements also require electricity. Usually the electricity is provided by a replaceable battery. The first use of electrical power in watches was as substitute for the mainspring, in order to remove the need for winding. The first electrically-powered watch, the Hamilton Electric 500, was released in 1957 by the Hamilton Watch Company of Lancaster, Pennsylvania.

Watch batteries (strictly speaking cells, a battery is composed of multiple cells) are specially designed for their purpose. They are very small and provide tiny amounts of power continuously for very long periods (several years or more). In most cases, replacing the battery requires a trip to a watch-repair shop or watch dealer; this is especially true for watches that are designed to be water-resistant, as special tools and procedures are required to ensure that the watch remains water-resistant after battery replacement. Silver-oxide and lithium batteries are popular today; mercury batteries, formerly quite common, are no longer used, for environmental reasons. Cheap batteries may be alkaline, of the same size as silver-oxide but providing shorter life. Rechargeable batteries are used in some solar powered watches.

Solar powered watches are powered by light. A photovoltaic cell on the face (dial) of the watch converts light to electricity, which in turn is used to charge a rechargeable battery or capacitor. The movement of the watch draws its power from the rechargeable battery or capacitor. As long as the watch is regularly exposed to fairly strong light (such as sunlight), it never needs battery replacement, and some models need only a few minutes of sunlight to provide weeks of energy (as in the Citizen Eco-Drive).

Some of the early solar watches of the 1970s had innovative and unique designs to accommodate the array of solar cells needed to power them (Synchronar, Nepro, Sicura and some models by Cristalonic, Alba, Seiko and Citizen). As the decades progressed and the efficiency of the solar cells increased while the power requirements of the movement and display decreased, solar watches began to be designed to look like other conventional watches.A rarely used power source is the temperature difference between the wearer's arm and the surrounding environment (as applied in the Citizen Eco-Drive Thermo). -Wikipedia-

Watch | Mainspring

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Mainspring watches, A Traditional mechanical watch movements use a spiral spring called a mainspring as a power source. In manual watches the spring must be rewound by the user periodically by turning the watch crown. Antique pocketwatches were wound by inserting a separate key into a hole in the back of the watch and turning it. Most modern watches are designed to run 40 hours on a winding, so must be wound daily, but some run for several days and a few have 192-hour mainsprings and are wound weekly.

A modern watch mainspring is a long strip of hardened and blued steel, or specialised steel alloy, 20-30 centimeters long and 0.05-0.2 millimeters thick. The mainspring in the common 1-day movement is calculated to enable the watch to run for 36 to 40 hours, i.e. with a power-reserve for 12 to 16 hours, which is the normal standard for hand-wound as well as self-winding watches. 8-Day movements provide power for at least 192 hours but use longer mainsprings and bigger barrels. Clock mainsprings are similar, only larger.

Since 1945, carbon steel alloys have been increasingly superseded by newer special alloys (iron, nickel and chromium with the addition of cobalt, molybdenum, or beryllium), and also by cold-rolled alloys ('structural hardening'). Known to watchmakers as 'white metal' springs (as opposed to blued carbon steel), these are stainless and have a higher elastic limit. They are less subject to permanent bending (becoming 'tired') and there is scarcely any risk of their breaking. Some of them are also practically non-magnetic.
In their relaxed form, mainsprings can have three distinct shapes:
* Spiral coiled: i.e. coiled in the same direction throughout, viz. that of a spring inside the barrel
* Semi-reverse: The outer end of the spring is coiled in the reverse direction to form an angle less than 360 degrees.
* Reverse (resilient): the outer end of the spring is coiled in the reverse direction to form an angle exceeding 360 degrees.

The reverse coils provide extra force at the end of the running period, in order to keep the timepiece running at a constant rate to the end

Watch Electronic movements

Men's Watches
Watch, Electronic movements have few or no moving parts, as they use the piezoelectric effect in a tiny quartz crystal to provide a stable time base for a mostly electronic movement. The crystal forms a quartz oscillator which resonates at a specific and highly stable frequency, and which can be used to accurately pace a timekeeping mechanism. For this reason, electronic watches are often called quartz watches. Most quartz movements are primarily electronic but are geared to drive mechanical hands on the face of the watch in order to provide a traditional analog display of the time, which is still preferred by most consumers.

The first prototypes of electronic quartz watches were made by the CEH research laboratory in Switzerland in 1962. The first quartz watch to enter production was the Seiko 35 SQ Astron, which appeared in 1969. Modern quartz movements are produced in very large quantities, and even the cheapest wristwatches typically have quartz movements. Whereas mechanical movements can typically be off by several seconds a day, an inexpensive quartz movement in a child's wristwatch may still be accurate to within half a second per day—ten times better than a mechanical movement. Some watchmakers combine the quartz and mechanical movements, such as the Seiko Spring Drive, introduced in 2005.

Radio time signal watches are a type of electronic quartz watch which synchronizes (time transfer) its time with an external time source such as an atomic clocks, time signals from GPS navigation satellites, the German DCF77 signal in Europe, WWVB in the US, and others. Movements of this type synchronize not only the time of day but also the date, the leap-year status of the current year, and the current state of daylight saving time (on or off).

Mechanical watch

Watch
Compared to electronic movements, mechanical watches are less accurate, often with errors of seconds per day, and they are sensitive to position and temperature. As well, they are costly to produce, they require regular maintenance and adjustment, and they are more prone to failure. Nevertheless, the "old world" craftsmanship of mechanical watches still attracts interest from part of the watch-buying public.

Mechanical movements use an escapement mechanism to control and limit the unwinding of the spring, converting what would otherwise be a simple unwinding, into a controlled and periodic energy release. Mechanical movements also use a balance wheel together with the balance spring (also known as a hairspring) to control motion of the gear system of the watch in a manner analogous to the pendulum of a pendulum clock. The tourbillon, an optional part for mechanical movements, is a rotating frame for the escapement which is used to cancel out or reduce the effects of bias to the timekeeping of gravitational origin. Due to the complexity of designing a tourbillon, they are very expensive, and only found in "prestige" watches. The pin-lever (also called Roskopf movement after its inventor, Georges Frederic Roskopf), is a cheaper version of the fully levered movement which was manufactured in huge quantities by many Swiss manufacturers as well as Timex, until it was replaced by quartz movements.

A watch

Watches for Man & Ladies

A watch is a timepiece that is made to be worn on a person. It is usually a wristwatch, worn on the wrist with a strap or bracelet. In addition to the time, modern watches often display the day, date, month and year, and electronic watches may have many other functions.

Most inexpensive and medium-priced watches used mainly for timekeeping are electronic watches with quartz movements. Expensive, collectible watches valued more for their workmanship and aesthetic appeal than for simple timekeeping, often have purely mechanical movements and are powered by springs, even though mechanical movements are less accurate than more affordable quartz movements.

Before the inexpensive miniaturization that became possible in the 20th century, most watches were pocket watches, which often had covers and were carried in a pocket and attached to a watch chain or watch fob. Watches evolved in the 1600s from spring powered clocks, which appeared in the 1400s.
Watch Movement
Watch Mechanical movements
Watch sElectronic movements
Watches Power sources
Mainspring
Automatic watch
Watch batteries
Solar powered watches
Watches Display:
Analog
Digital