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This is a genuine MIYOTA minute wheel for the 9015 movement, made in Japan, designed for the 9015 premium automatic caliber. Positioned between the cannon pinion and the hour wheel, it transmits power from the cannon pinion to the hour wheel while achieving a 12:1 reduction ratio to drive the hour hand as a core transmission component for accurate timekeeping. This product is brand new and original, not a generic replacement part.
Brand:MIYOTA (by CITIZEN)
Compatible Movement:9015 premium automatic caliber (9000-series ultra-thin)
Part Name:Minute Wheel
Part Number:025-A17
Origin:Made in Japan
Quality:Genuine original, brand new
Function:Transmits power from cannon pinion to hour wheel (with 12:1 reduction ratio)
Movement Height:3.90mm
Movement Size:11½ ligne (25.94mm)
Beat Rate:28,800 bph (4Hz)
Jewels:24
1. Is this minute wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part with part number 025-A17, made in Japan.
2. Which movements is this minute wheel compatible with?
It fits the MIYOTA 9015 automatic caliber. The 9015 is a date movement measuring just 3.90mm thick, 11½ ligne (25.94mm), with a beat rate of 28,800 bph (4Hz) , 24 jewels, and approximately 42 hours of power reserve. Verify your movement main plate is marked 9015 before installation.
3. What happens if the minute wheel is worn or damaged?
The minute wheel is a critical transmission component connecting the cannon pinion and hour wheel. Wear or damage can cause the hour hand to stop, run incorrectly, or jam, affecting time readability. As it drives the hour hand at a 12:1 reduction ratio, tooth precision directly impacts accuracy. Common symptoms include: hour and minute hand desynchronization, and abnormal setting resistance. Timely replacement is recommended.
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