Seiko Men's 5 SPORTS Analog Sport Automatic JAPAN Watch SNZG09J1 (Watch with a balance wheel to regulate time and a mainspring as its source of energy. The mainspring is wound by the movement of the wearer.) If the watch is completely stopped, manually turn the crown approximately 20 times to wind up the mainspring to start the watch. Timekeeping Accuracy : +/- 15s/day
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