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This is a genuine MIYOTA reduction wheel for the 8200 movement, made in Japan, designed for the 8200 series automatic calibers. It serves as a key transmission component in the unidirectional winding system, reducing and transferring the rotor’s rotational motion to the mainspring barrel for automatic winding. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：8200 / 8205 / 8215 and other 8200 series automatic calibers
Part Name：Reduction Wheel (Automatic Winding Reduction Wheel)
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Automatic winding power reduction and transmission
Winding Type：Unidirectional (only winds when rotor turns counterclockwise)
1. Is this reduction wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan.
2. Which movements is this reduction wheel compatible with?
It fits MIYOTA 8200 series automatic calibers, including 8200, 8205, 8215, and CITIZEN-branded 8200A, 8210A. Verify your movement main plate marking before installation.
3. What happens if the reduction wheel is damaged?
The reduction wheel is a key component of the unidirectional winding system. Damage can cause reduced or complete loss of automatic winding efficiency, leaving only manual winding. The 8200 series features unidirectional winding (winds only when the rotor turns counterclockwise)—if the reduction wheel is worn, winding efficiency will further decrease.
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