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  2. Seiko - Wikipedia

    en.wikipedia.org/wiki/Seiko

    The King Seiko 56KS movements were the same as those used in Grand Seiko’s 56GS series, Seiko Lord Matic watches, and Seiko chronometers. It was also introduced in 1968 and featured an automatic, 28,800 bph movement with 25 jewels and a 47-hour power reserve.

  3. Automatic quartz - Wikipedia

    en.wikipedia.org/wiki/Automatic_quartz

    The first such watch was released in Germany in January 1988 and April of the same year in Japan (under the name Auto-Quartz). [3] The watches had an average monthly rate of ±15 sec and provided 75 hours of continuous operation when fully powered. Early automatic quartz movements were called AGS (Automatic Generating System).

  4. Automatic watch - Wikipedia

    en.wikipedia.org/wiki/Automatic_watch

    Only one example is known, made in 1806. [17] As noted above, some watches used bidirectional winding and others used unidirectional winding. The latter is sufficient and all of Breguet's watches used unidirectional winding. Before the invention of the slipping mainspring, automatic watches had a system for locking the weight.

  5. Quartz crisis - Wikipedia

    en.wikipedia.org/wiki/Quartz_crisis

    Quartz movement of the Seiko Astron, 1969. The quartz crisis (Swiss) or quartz revolution (America, Japan and other countries) was the advancement in the watchmaking industry caused by the advent of quartz watches in the 1970s and early 1980s, that largely replaced mechanical watches around the world.

  6. Astron (wristwatch) - Wikipedia

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

    The Astron was unveiled in Tokyo on December 25, 1969, after ten years of research and development at Suwa Seikosha (currently named Seiko Epson), a manufacturing company of Seiko Group. Within one week 100 gold watches had been sold, at a retail price of 450,000 yen ( US$1,250 (equivalent to $10,386 in 2023)) each (at the time, equivalent to ...

  7. Spring Drive - Wikipedia

    en.wikipedia.org/wiki/Spring_Drive

    [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] The 1st spring drive automatic-wind movement of Grand Seiko was released in September 2004, the reference number is SBGA001.

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