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This is a genuine MIYOTA third wheel for the 1M02 movement, made in Japan, designed for the 1M02 quartz caliber. It serves as the key intermediate gear in the gear train, smoothly transmitting power from the center wheel to the seconds wheel for accurate timekeeping. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：1M02 quartz caliber (3-hand day-date)
Part Name：Third Wheel
Part Numbers：017-1130 or 084-2500
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Power transmission from center wheel to seconds wheel
1. Is this third wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part with part numbers 017-1130 or 084-2500, made in Japan.
2. Which movements is this third wheel compatible with?
It fits the MIYOTA 1M02 quartz caliber (10½ ligne, 23.7mm×22.6mm). This is a 3-hand day-date movement with day/date at 3 o’clock. This part differs from the 1M12 (date-only) and 1L12 (smaller size) variants—verify your movement model before installation.
3. What happens if the third wheel is damaged?
The third wheel is the key intermediate gear in the gear train, positioned between the center wheel and the seconds wheel. Damage can cause timekeeping errors, hand stoppage, or power transmission failure. The 1M02 offers accuracy of ±20 seconds/month—third wheel precision directly impacts performance. Timely replacement is recommended.
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