Seiko 5641 Movement Details

Seiko caliber 5641 is a high grade automatic watch movement. Production was in the 1970s.
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Sub-brands: Grand Seiko
Day / date?No
GMT / world time?No
Chronograph?No
Hacking?Yes
Rate:28,800 bph
Number of jewels:25
Lift angle:56º
Size / diameter:25.6mm
Height:4.5mm
Stem code: 354560
Balance wheel code: 310561
Mainspring code: 401565
Screw codes: 022150 (stud screw), 022252, 022257, 022373, 022454, 022457, 022458 (screw for oscillating weight), 022467, 022484, 022486, 022662, 022667, 022753, 022761 (dial screw)
Development division:Suwa (Nagano)
Notes:The same as cal. 5645 and cal. 5646 but without date or day display.
Related movements: 5645 5646