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This is a genuine MIYOTA second wheel for the 1M02 movement, made in Japan, designed for the 1M02 day-date quartz caliber. It serves as the final output gear of the timekeeping system, driving the central seconds hand to step every second for precise 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：Second Wheel / Sweep Second Wheel
Part Number：023-1840
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Drives the central seconds hand
1. Is this second wheel an original CITIZEN/MIYOTA genuine part?
Yes, made in Japan.
2. Which movements is this second wheel compatible with?
It fits the MIYOTA 1M02 quartz caliber (10½ ligne size, 23.30mm). This is a 3-hand day-date movement with hacking seconds. The 1M02 can replace Citizen 1100A, 1101, 1102, etc.—but always verify against your old part.
3. What happens if the second wheel is damaged?
The second wheel is the final output gear of the timekeeping system. Damage can cause the seconds hand to stop, wobble, or jam, affecting normal timekeeping. The 1M02 offers accuracy of ±20 seconds/month—second wheel precision directly impacts performance. Timely replacement is recommended.
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