Seiko 4S77 Movement Details

Seiko caliber 4S77 is a high grade automatic (with hand winding) watch movement.
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Sub-brands: Credor
Power reserve:50 hours
Accuracy:+15/-10 seconds/day (Seiko "B" standard)
Day / date?Day + date
GMT / world time?Yes
Chronograph?No
Hacking?Yes
Rate:28,800 bph
Number of jewels:28
Size / diameter:25.6mm
Height:5.38mm
Stem code: 354132
Balance wheel code: 310034
Mainspring code: 201275
Screw codes: 012121 (stud screw), 012201, 012284, 012285, 012354, 012513 (ratchet wheel screw), 012672, 012673, 012726 (case screw), 012744, 012820
Notes:Has a retrograde day display. The same as cal. 4S27 but with higher grade finishing.
PDF guides: Technical guide : 4S77A
Related movements: 4S27

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