Seiko 7S55 Movement Details

Seiko caliber 7S55 is an automatic watch movement. Production was in the 2000s.
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Sub-brands: Seiko 5, Superior
Power reserve:41 hours
Accuracy:+45/-35 seconds/day
Day / date?Date only
GMT / world time?No
Chronograph?No
Hacking?No
Rate:21,600 bph
Number of jewels:23
Lift angle:53º
Size / diameter:27.0mm
Height:4.9mm
Balance wheel code: 310020, 310197
Mainspring code: 201024
Screw codes: 012123 (stud screw), 012168, 012354, 012420, 012539 (second reduction wheel screw), 012919 (ratchet wheel screw), 016705
Notes:Same as cal. 7S35 but with decorative "Tokyo Stripes" rotor and higher grade finish, for use in the Seiko 5 Superior range with display backs.
PDF guides: Technical guide : 7S25A, 7S35A & 7S55A
Related movements: 7S25 7S26 7S35 7S36

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