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This is a genuine MIYOTA 12H second wheel, made in Japan, designed for the 9100 automatic mechanical movement. It is a transmission component for the power reserve indicator at 12 o’clock, driving the hand to display remaining mainspring energy as one of the movement’s key complications. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：9100 / 9132 automatic mechanical movements
Part Name：12H Second Wheel (power reserve indicator drive)
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Drives the power reserve hand at 12 o’clock
Movement Diameter：30.2mm (13½ ligne)
Movement Height：5.52mm
Frequency：28,800 bph (4Hz)
1. Is this 12H second wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan.
2. What happens if the 12H second wheel is damaged?
The 12H second wheel drives the power reserve indicator. Damage can cause the power reserve hand at 12 o’clock to stop or misread, affecting this complication. Power reserve accuracy is critical for assessing remaining mainspring energy (approx. 40 hours when fully wound). Timely replacement is recommended.
3. Does this part come with installation tools or instructions?
No. This is a single precision component. Installation requires professional tools; work should be performed by a qualified watchmaker.
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