Seiko 4S12 Movement Details

Seiko caliber 4S12 is an automatic (with hand winding) watch movement.
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Sub-brands: SUS
Power reserve:40 hours
Accuracy:+25/-15 seconds/day (Seiko "C" standard)
Day / date?Date only
GMT / world time?Yes
Rate:28,800 bph
Number of jewels:25
Lift angle:52º
Notes:Same as cal. 4S15 but with a GMT hand.
PDF guides:
Related movements: 4S15

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