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This is a genuine MIYOTA date wheel for the 0S10/0S20 movement, made in Japan, designed for the 0S10/0S20 quartz chronograph calibers. It serves as the core component of the calendar mechanism, responsible for automatically advancing the date numeral during the midnight hours and working with the keyless works for rapid date correction. The 0S10/0S20 series date wheels are available in multiple position variants (3H, 4H, between 4-5H, 6H) and different background colors (white/black). This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movements：0S10 / 0S20 quartz chronograph calibers
Part Name：Date Wheel
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Automatic date advancement (during midnight hours), with quickset function
Date Versions：3 o’clock (standard), 4 o’clock, between 4–5 o’clock, 6 o’clock
Date Colors：White or Black background
1. Is this date wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan.
2. Which movements is this date wheel compatible with?
It fits MIYOTA 0S10 and 0S20 series chronograph calibers, including 0S1A/0S2A variants. Both measure 13½ ligne (30.80mm) but differ in height: 0S10 is 4.13mm, 0S20 is 5.10mm. Verify your movement caliber and date window position before installation.
3. How do I choose the correct date wheel version?
The 0S10/0S20 series date wheels are available in multiple versions corresponding to different date window positions. The base version is at 3 o’clock, with additional versions for 4 o’clock, between 4–5 o’clock, and 6 o’clock, as well as white/black background colors. Confirm your dial’s date window position and color before selecting the matching date wheel.
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