Grand Seiko 9R31
Grand Seiko
A Grand Seiko Spring Drive caliber combining a mechanical mainspring with an electronically regulated glide wheel for a perfectly continuous, gliding seconds hand. The 9R31 is a manual-wind Spring Drive offering about 72 hours of power reserve and roughly ±1 second per day accuracy.
28,800
vph (4.0Hz)
72h
Power Reserve
37
Jewels
0mm
Ø × 0mm
Hacking: Yes
Hand-winding: Yes
Watches using this caliber (0)
No watches in the database currently use this caliber.