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  2. MIL-W-46374 - Wikipedia

    en.wikipedia.org/wiki/MIL-W-46374

    MIL-W-46374 is a specification first published on October 30, 1964, [1] for US military watches. [2] The 46374 was specified as an accurate, disposable watch. In its span, it encompassed metal and plastic cased watches with both mechanical and quartz movements. [2] The 46374 replaced the MIL-W-3818, reducing cost and inheriting the dial from ...

  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. Ronda (watchmaker) - Wikipedia

    en.wikipedia.org/wiki/Ronda_(watchmaker)

    Ronda AG is a Swiss manufacturer of quartz and mechanical watch movements. [1] The company was founded in 1946 by William Mosset and the current headquarters are located in Lausen, Basel-Landschaft. [2] Their movements are used in a variety of watches around the world, including RSC pilot's watches, Shinola, Prim and Mondaine watches. [3] [4 ...

  5. Jewel bearing - Wikipedia

    en.wikipedia.org/wiki/Jewel_bearing

    In modern quartz watches, the timekeeper is a quartz crystal in an electronic circuit, powering a small stepper motor. Because of the small amount of torque needed to move the hands, there is almost no pressure on the bearings and no real gain by using a jewel bearing, hence they are not used in a large proportion of quartz movements.

  6. Eco-Drive - Wikipedia

    en.wikipedia.org/wiki/Eco-Drive

    In 2012 Citizen announced the Eco-Drive RING Concept Model. This watch features a ring-shaped solar cell surrounding the watch case sidewall. [13] [14] In 2018 Citizen announced it developed the Caliber 0100 Eco-Drive prototype autonomous high-accuracy quartz watch movement which is claimed to be accurate to ± 1 second per year. [15]

  7. Spring Drive - Wikipedia

    en.wikipedia.org/wiki/Spring_Drive

    The Spring Drive movement was announced publicly in 1997 and presented at the 1998 Basel Watch Fair. [1] [8] In 1999, the first production models were made available in Japan as limited edition, manual-wind watches in both the Credor and Seiko brands. [2] [5] [8] The first non-limited model was released in Japan in 2002. [5]

  8. Armitron - Wikipedia

    en.wikipedia.org/wiki/Armitron

    It specialized in LED-powered, five-function (hour, minutes, second, day and date) digital watches. The Armitron brand name is a combination of “Armin” and “electronics”. Often using cases from Switzerland and bracelets from Hong Kong, Armitron watches were built in a custom-designed factory in Arlington, Texas.

  9. Quartz clock - Wikipedia

    en.wikipedia.org/wiki/Quartz_clock

    It is also possible for quartz clocks and watches to have their quartz crystal oscillate at a higher frequency than 32 768 (= 2 15) Hz (high frequency quartz movements [4]) and/or generate digital pulses more than once per second, to drive a stepping motor powered second hand at a higher power of 2 than once every second, [5] but the electric ...

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