Seiko 7S26 Movement Details

Seiko caliber 7S26 is an automatic watch movement produced from around 1996.
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Sub-brands: Seiko 5, S-Wave
Power reserve:41 hours
Accuracy:+35/-25 seconds/day
Day / date?Day + date
GMT / world time?No
Rate:21,600 bph
Number of jewels:21
Lift angle:53º
Size / diameter:27.0mm
Stem code: 351260 (tap 10), 351261 (tap 10)
Balance wheel code: 310020, 310197
Mainspring code: 201024, 201075, 201083
Notes:The same as cal. 7S25 but with day display (as well as date). The difference between 7S26A and 7S26B is an upgrade to an Echtacron-style regulator for easier adjustment. Changes in 7S26C are the addition of a lower arbor jewel and making all four date dial guard screws identical – no more frustratingly small cross-head screw!
PDF guides: Technical guide for 7S26A & 7S36A
Technical guide for 7S26B & 7S36B
Technical guide for 7S26C & 7S36C
Related movements: 7S25 7S35 7S36 7S55