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This is a genuine MIYOTA hour wheel for the 0S1A movement, made in Japan, designed for the 0S1A quartz chronograph caliber. It serves as a core transmission component for the timekeeping and chronograph display system, driving the hour hand and coordinating with the 12H and 9H chronograph wheel trains for full multifunction display. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：0S1A quartz chronograph caliber
Part Name：Hour Wheel
Part Number：MY075.472
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Drives the hour hand
1. Is this hour wheel an original CITIZEN/MIYOTA genuine part?
Yes, made in Japan.
2. Which movements is this hour wheel compatible with?
It fits MIYOTA 0S1A chronograph calibers (13½ ligne, 30.80mm). The 0S1A is the high hand version of the 0S10, featuring: 60-minute totalizer at 12 o’clock, small seconds at 6 o’clock, 12-hour totalizer at 9 o’clock, and date at 3 o’clock. The winding stem part number is 065-453.
3. What happens if the hour wheel is damaged?
The hour wheel is a core component for driving the hour hand. Damage can cause the hour hand to stop, run incorrectly, or jam. The 0S1A chronograph can measure up to 11 hours 59 minutes 59 seconds—hour wheel precision directly impacts timekeeping and chronograph accuracy.
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