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This is a genuine MIYOTA 6H small second wheel for the 6S10/6S20 movement, made in Japan, designed for the 6S10/6S20 quartz chronograph calibers. It serves as the drive component for the small seconds hand at 6 o’clock, transmitting movement power to ensure precise regular timekeeping as a key transmission component of the timekeeping system. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movements：6S10 / 6S20 quartz chronograph calibers
Part Name：6H Small Second Wheel (Second Chronograph Wheel 6H)
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Drives the small seconds hand at 6 o’clock (regular timekeeping small seconds)
1. Is this 6H small second wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan.
2. Which movements is this small second wheel compatible with?
It fits MIYOTA 6S10 and 6S20 quartz chronograph movements—they share the same base caliber (15 ligne, 4.90mm height). The 6S10/6S20 feature small seconds at 6 o’clock, 1/20 second chronograph at 12 o’clock, and a 60-minute totalizer at 9 o’clock.
3. What happens if the 6H small second wheel is damaged?
This wheel drives the small seconds hand at 6 o’clock (regular timekeeping). Damage can cause the small seconds hand to stop or run incorrectly, affecting regular timekeeping. This part is not interchangeable with other chronograph subdial drive wheels (12H 1/20 second wheel, 9H chronograph minute wheel)—verify the position marking on your old part.
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