The Miyota FS21 is a 0-jewel quartz chronograph movement featuring central hour, minute, and seconds hands, three sub-dials, and a suspended date window at 4:30. It measures 10½ ligne (23.70 mm × 22.00 mm), with a movement thickness of 5.10 mm and an overall height of 6.89 mm. The sub-dial at 2 o’clock displays 24 hours, the one at 6 o’clock tracks running seconds, and the one at 10 o’clock records chronograph minutes. Designed with parallel pushers for straight-walled cases, it uses hole sizes 120/70/17/26 (hour/minute/seconds/sub-dials), operates on a 377 battery, and requires stem part number 065-549 (tap 0.90 mm / tap 10).
