Seiko 4S15 Movement Details

Seiko caliber 4S15 is a high grade automatic (with hand winding) watch movement. Production started around 1995.
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Sub-brands: Alpinist, King Seiko, SUS, Laurel
Power reserve:40 hours
Accuracy:+25/-15 seconds/day (Seiko "C" standard)
Day / date?Date only
GMT / world time?No
Rate:28,800 bph
Number of jewels:25
Lift angle:52º
Size / diameter:25.6mm
Notes:Same as cal. 4S12 but without a GMT hand.
PDF guides: Technical guide : 4S15A
Related movements: 4S12 4S25 4S35

Part Codes

Stem code: 354132
Balance wheel code: 310034
Mainspring code: 201054
Screw codes: 012121 (stud screw), 012284, 012285, 012354, 012513 (ratchet wheel screw), 012672, 012673, 012726 (case screw), 012744, 012753, 012820

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