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2. Seiko - Wikipedia

   en.wikipedia.org/wiki/Seiko

   Seiko Group Corporation (セイコーグループ株式会社, Seikō Gurūpu kabushiki gaisha), commonly known as Seiko (/ ˈ s eɪ k oʊ / SAY-koh, Japanese:), is a Japanese maker of watches, clocks, electronic devices, semiconductors, jewelry, and optical products.

3. Seikosha - Wikipedia

   en.wikipedia.org/wiki/Seikosha

   Seiko Quartz Astron 35SQ, the world's first commercial quartz watch developed by Suwa Seikosha. 1881 — Kintarō Hattori opens the watch and jewelry shop "K. Hattori" (Hattori Tokeiten in Japanese; currently named Seiko Holdings Corporation) in the Ginza area of Tokyo, Japan.

4. Automatic quartz - Wikipedia

   en.wikipedia.org/wiki/Automatic_quartz

   'Seiko Quartz Automatic Generating System' (A.G.S. = early Kinetic), Perpetuum Nobile (produced in 1989), Cal. 7M45, No. 246 of 700 Seiko AGS SCUBA Diver 200m 5M23-6A60, 1993 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 ...

5. 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 ...

6. 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

7. Astron (wristwatch) - Wikipedia

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

   The Astron wristwatch, formally known as the Seiko Quartz-Astron 35SQ, was the world's first "quartz clock" wristwatch. It is now registered on the List of IEEE Milestones as a key advance in electrical engineering .