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This is a genuine MIYOTA minute wheel for the 1M12 movement, made in Japan, designed for the 1M12 quartz caliber. 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 Movement：1M12 quartz caliber (3-hand with date)
Part Name：Minute Wheel
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 an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan.
2. Which movements is this minute wheel compatible with?
It fits the MIYOTA 1M12 quartz caliber (10½ ligne size, 23.7×22.6mm). This is a 3-hand with date movement (date at 3 o’clock) featuring hacking seconds. The 1M12 has been superseded by GM10 or GM12. This part differs from the 1M02 (day-date) and 1L12 (smaller size) variants—verify against your old part.
3. What happens if the minute wheel is damaged?
The minute wheel is a 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 1M12 offers accuracy of ±20 seconds/month—minute wheel precision directly impacts timekeeping. Timely replacement is recommended.
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