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2. Miyota (watch movement manufacturer) - Wikipedia

   en.wikipedia.org/wiki/Miyota_(watch_movement...

   Miyota produces various 'standard' and 'premium' grade mechanical movements for automatic wristwatches.. The Miyota 8215 is an entry level non-hacking-earlier versions twenty-one jewel three-hand with date automatic wristwatch movement with a uni-directional winding system (left rotation) with an accuracy of -20 to +40 seconds per day, and a power reserve of over 40 hours.

3. List of ETA Movements - Wikipedia

   en.wikipedia.org/wiki/List_of_ETA_Movements

   2890 (automatic, sweep-second, 21 jewels, 28800vph, reserve 42h) 2770 (automatic, sweep-second, 17/21/25 jewels, 21600vph, reserve 46h)

4. Automatic quartz - Wikipedia

   en.wikipedia.org/wiki/Automatic_quartz

   Automatic quartz is a collective term describing watch movements that combine a self-winding rotor mechanism [1] (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 inconvenience and environmental impact of ...

5. Citizen Watch - Wikipedia

   en.wikipedia.org/wiki/Citizen_Watch

   Citizen Promaster Automatic NY0040-09EE diving watch. In 1959, Citizen launched the Parawater – Japan's first fully-waterproof wristwatch. It became the forerunner to Citizen's range of dive watches, subsequently (1982) called the Promaster Marine range. Also in 1982, Citizen launched the 1300m Professional Diver's watch – the world's most ...

6. Hamilton Watch Company - Wikipedia

   en.wikipedia.org/wiki/Hamilton_Watch_Company

   The Model 21 Hamilton Marine Chronometer for large vessels was built first and had a chain-drive fusee, the second hand advanced in 1 ⁄ 2-second increments over a 60-second-marked sub-dial, and was kept in a traditional gimbaled double box for the express purpose of keeping the clock in a "dial up" position to minimize ship-movement-induced ...

7. Mechanical watch - Wikipedia

   en.wikipedia.org/wiki/Mechanical_watch

   Around the 1960s this 'jewel craze' reached new heights, and manufacturers made watches with 41, 53, 75, or even 100 jewels. [21] [22] Most of these additional jewels were totally nonfunctional; they never contacted moving parts, and were included just to increase the jewel count. For example, the Waltham 100 jewel watch consisted of an ...