Seiko Markets Quartz Watch

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Quartz Wristwatch
The Seiko Quartz-Astron 35SQ, the first commercial quartz wristwatch, was introduced in Tokyo on December 25, 1969. Accurate to within five seconds per month, its crucial elements included a quartz crystal oscillator, a hybrid integrated circuit, and a miniature stepping motor to turn the hands.

See also: Pioneering Work on the Quartz Electronic Wristwatch, Technological Innovations and the Summer Olympic Games