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This is a genuine MIYOTA minute wheel and pinion for the 0S10/0S20 movement, made in Japan, designed for the 0S10/0S20 quartz chronograph calibers. It serves as the core transmission component of the timekeeping gear train, transmitting power from the center wheel to the hour wheel to ensure precise hour and minute hand coordination. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movements：0S10 / 0S20 quartz chronograph calibers, including 0S1A/0S2A variants
Part Name：Minute Wheel And Pinion
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Power transmission from center wheel to hour wheel, drives the minute hand
1. Is this minute wheel and pinion an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan.
2. Which movements is this part compatible with?
It fits MIYOTA 0S10 and 0S20 series chronograph calibers, including 0S1A/0S2A variants. Both measure 13½ ligne (30.80mm) but differ in height: 0S10 is 4.13mm, 0S20 is 5.10mm. The 0S10 features chronograph hour/min/sec and date, while the 0S20 features chronograph min/sec and a 24-hour indicator.
3. What happens if the minute wheel and pinion is damaged?
This part is the core transmission component of the timekeeping gear train, positioned between the center wheel and the hour wheel. Damage can cause the minute hand to stop, hour/minute hand desynchronization, or timekeeping errors. The 0S10/0S20 offer accuracy of ±20 seconds/month—timely replacement is recommended.
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