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  2. Automatic quartz - Wikipedia

    en.wikipedia.org/wiki/Automatic_quartz

    As of 2007, Seiko has sold more than eight million automatic quartz watches. [2] The different calibres of Kinetic watches currently are relatively large and heavy, weighing in at 1/3 of a pound (150 grams) or more on many models. Therefore, most Seiko Kinetic watches are only available in a men's size. Movement calibers: 1M20; 3M21 3M22 ...

  3. Seiko - Wikipedia

    en.wikipedia.org/wiki/Seiko

    Seiko put a second crystal in the watch that is linked with a processor that detects the change in temperature and signals the main oscillator to compensate. The result was a huge improvement in the watch's accuracy from five seconds per month to five seconds per year. Kinetic watches were introduced by Seiko in 1986 at the Basel Fair Trade ...

  4. Spring Drive - Wikipedia

    en.wikipedia.org/wiki/Spring_Drive

    The Seiko Spacewalk is a limited edition Spring Drive model, designed specifically for use in space Spring Drive is a name given to a series of watch movements produced by Epson in Shiojiri . The concept of using a mainspring to power a quartz timing package was first conceived in 1977 by Yoshikazu Akahane (赤羽 好和) at Suwa Seikosha [ 1 ...

  5. Watch - Wikipedia

    en.wikipedia.org/wiki/Watch

    In 1959 Seiko placed an order with Epson (a subsidiary company of Seiko and the 'brain' behind the quartz revolution) to start developing a quartz wristwatch. The project was codenamed 59A. By the 1964 Tokyo Summer Olympics, Seiko had a working prototype of a portable quartz watch which was used as the time measurements throughout the event.

  6. Category:Seiko - Wikipedia

    en.wikipedia.org/wiki/Category:Seiko

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  7. Pulsar (watch) - Wikipedia

    en.wikipedia.org/wiki/Pulsar_(watch)

    A modern analog Pulsar watch. Pulsar is a watch brand and currently a Seiko Watch Corporation of America (SCA) division. Pulsar was the world's first electronic digital watch. Current Pulsar watches are mostly analog and use the same movements in Seikos such as the 7T62 quartz chronograph movemen

  8. Automatic watch - Wikipedia

    en.wikipedia.org/wiki/Automatic_watch

    Backside view of an automatic watch with exhibition case back, showing its movement.The semicircular central rotor which winds the mainspring is plainly visible. Video of the rotor turning in an automatic wristwatch having a glass back, when the watch is moved by hand

  9. Astron (wristwatch) - Wikipedia

    en.wikipedia.org/wiki/Astron_(wristwatch)

    In 2019, Seiko released several limited edition Astron models to commemorate the 50th anniversary of the quartz Astron. [5] [6] Among them, the model produced in a limited edition of 50 pieces (3.8 million yen) mimics the original case design and has a rough engraving pattern by craftsmen belonging to Epson's "Micro Artist Workshop". [6]

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