Astron (wristwatch)
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The Astron wristwatch, formally known as the Seiko Quartz-Astron 35SQ, was the world's first "quartz clock" wristwatch, i.e., one based on a quartz crystal oscillator. It is now registered on the List of IEEE Milestones as a key advance in electrical engineering.
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 $1,250 each (at the time, equivalent to the price of a medium-sized Japanese automobile). Essential elements included a quartz crystal oscillator (8,192 cyles/second), a hybrid integrated circuit, and a miniature stepping motor to turn its hands. The Astron was accurate to ±5 seconds per month, or one minute per year.
