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2. 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)

3. 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.

4. Bozeman Watch Company - Wikipedia

   en.wikipedia.org/wiki/Bozeman_Watch_Company

   It has a Swiss automatic caliber (movement), 21 jewels with 28,800 VPH, a sweep second hand and date function, a 24-hour second-time zone on the outer dial, COSC certified, individually placed, raised luminescent hour markers, water resistance to 10 ATM below sea level, a 42 mm (1.7 in) stainless steel case and only 10.5 mm (0.41 in) in height ...

5. Gruen Watch Co. - Wikipedia

   en.wikipedia.org/wiki/Gruen_Watch_Co.

   The Gruen Watch Company was formerly one of the largest watch manufacturers in the United States. It was in business from about 1894 to 1958 and was based in Cincinnati , Ohio . It was founded in 1894 by German-born watchmaker Dietrich Grün, who changed the spelling of his name to "Gruen" because the letter ü does not exist in English.

6. Hamilton Watch Company - Wikipedia

   en.wikipedia.org/wiki/Hamilton_Watch_Company

   The Model 23 was a 16-size chronograph pocket watch. The Model 4992b was in a 16-size case with a black dial. It was used as the pocket watch for the U.S. military, featuring a less accurate 21-jewel railroad grade movement. [citation needed] By 1970, 13,086 Hamilton Model 21 Marine Chronometers had been produced.

7. Mechanical watch - Wikipedia

   en.wikipedia.org/wiki/Mechanical_watch

   The hand-winding movement of a Russian watch. A mechanical watch is a watch that uses a clockwork mechanism to measure the passage of time, as opposed to quartz watches which function using the vibration modes of a piezoelectric quartz tuning fork, or radio watches, which are quartz watches synchronized to an atomic clock via radio waves.