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This is a genuine MIYOTA hour wheel for the 8217 movement, made in Japan, designed for the 8217 automatic caliber. By engaging with the minute wheel, it transmits power to the hour hand at a 12:1 reduction ratio for 12-hour time display as a key component of the movement gear train. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：8217 automatic caliber (8200 series)
Part Name：Hour Wheel
Part Number：075-487
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Drives the hour hand (with 12:1 reduction ratio from the minute wheel)
Movement Size：11½ ligne (Φ26.0mm)
Movement Height：5.67mm
Beat Rate：21,600 bph (3Hz)
Jewels：21
Power Reserve：Approx. 42 hours
Functions：Automatic + hand winding, hacking, quick date setting, 24-hour display (at 9H)
1. Is this hour wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part with part number 075-487, made in Japan. The 8217 features 24-hour display and is part of the 8200 series.
2. Which movements is this hour wheel compatible with?
It fits the MIYOTA 8217 automatic caliber. The 8217 is a date movement with 24-hour display at 9 o’clock, featuring automatic/hand winding, hacking, and quick date setting, with accuracy of -20~+40 sec/day. Verify your movement main plate is marked 8217.
3. What happens if the hour wheel is damaged?
A damaged hour wheel 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 via the minute wheel, tooth precision directly impacts accuracy. Timely replacement is recommended.
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