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This is a genuine MIYOTA winding pinion for the 0S10/0S20 movement, made in Japan, designed for the 0S10/0S20 quartz chronograph calibers. It serves as the core drive component of the winding and setting system, transmitting crown rotation power to the setting mechanism and calendar train for time setting and date quickset functions. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movements：0S10 / 0S20 quartz chronograph calibers
Part Name：Winding Pinion
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Time setting and date quickset power transmission
1. Is this winding pinion an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan.
2. Which movements is this winding pinion compatible with?
It fits MIYOTA 0S10 and 0S20 quartz chronograph movements. Both measure 13½ ligne (30.80mm). The 0S10 has a height of 4.13mm with a 3‑eye layout (60-min totalizer at 12H, small seconds at 6H, 12H totalizer at 9H) and date at 3H. The 0S20 has a height of 5.10mm with a 3‑6‑9 subdial configuration.
3. What happens if the winding pinion is damaged?
The winding pinion is the core drive component of the winding and setting system. Damage can cause time setting failure or abnormal date quickset, affecting normal watch operation. The 0S10/0S20 series is known for its chronograph functionality—winding pinion failure directly affects crown operation. Timely replacement is recommended.
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