The Seiko caliber 8S23 (aka 8S23A) is a solar powered quartz watch movement with a day/date. It has 2 jewels...
8S23A
The Seiko caliber 8S21 (aka 8S21A) is a 3-hander, no-date solar powered quartz watch movement. It has 2 jewels and...
8S23A
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