Seiko 9ST1 Movement Details

Seiko caliber 9ST1 is a high grade hand winding watch movement. Production started around 2022.
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Sub-brands: Grand Seiko
Power reserve:72 hours
Accuracy:+5/-3 seconds/day (Seiko "AA" standard)
Day / date?No
GMT / world time?No
Chronograph?No
Rate:28,800 bph
Number of jewels:44
Size / diameter:35.0mm
Height:7.98mm
Notes:An innovative movement combining a tourbillon and a constant-force mechanism as one unit on a single axis for the first time in horological history. This movement is an evolution of cal. T0 constant-force tourbillon concept movement and first appeared in a limited edition Grand Seiko watch named "Kodo" (SLGT003).
Related movements: T0