Seiko 4R16 Movement Details

Seiko caliber 4R16 is an automatic watch movement. Production started around 2008.
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Power reserve:50 hours
Accuracy:+45/-35 seconds/day
Day / date?Day + date
GMT / world time?No
Rate:21,600 bph
Number of jewels:22
Lift angle:53º
Size / diameter:27.0mm or 12"
Notes:Together with cal. 4R15, was intended as a replacement of the popular cal. 7S26. Also sold as NH16. This movement is similar to cal. 4R15 but with day display (as well as date).
PDF guides: Technical guide : 4R15A, 4R15B, 4R16A & 4R16B
Related movements: 4R15

Part Codes

Balance wheel code: 310197
Mainspring code: 201164, 201267