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[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.
The 9F quartz movement is used in Grand Seiko quartz watches. [72] The Grand Seiko's 9F quartz movement is assembled entirely by hand by two expert craftsmen. Features include: Backlash auto-adjust mechanism; Twin pulse control motor; Instant date change mechanism – it can change the date display in 1/2000th of a second
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.
Grand Seiko's Grand Plan to Win Over Western Watch Lovers
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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). In 1991 the company introduced the Kinetic brand name. [4] Today Seiko offers a wide range of watches with various Kinetic movements.