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This is a genuine MIYOTA date driving wheel for the 8200 movement, made in Japan, designed for 8200 series automatic calibers (8200/8205 day-date models). It serves as a key transmission component in the calendar quick-set mechanism, driven by the U-shaped finger of the corrector lever (Swan Lever) to advance the date ring during crown operation. Made of plastic, this wheel is designed to break first when quick-set is forced—a common wear part in the 8200 calendar system. This product is brand new and original, not a generic replacement part.
Brand:MIYOTA (by CITIZEN)
Compatible Movement:8200 / 8205 and other 8200 series day-date automatic calibers
Part Name:Date Driving Wheel / Date Dial Driving Wheel
Material:Plastic (sacrificial component designed to protect the metal corrector lever)
Origin:Made in Japan
Quality:Genuine original, brand new
Function:Driven by the corrector lever to advance the date ring for quick-set adjustment
1. Is this date driving wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan.
2. Which movements is this date driving wheel compatible with?
It fits MIYOTA 8200 / 8205 day-date automatic calibers. The 8200 is the day-date version (date + weekday), where this wheel drives the date ring quick-set.
3. Why is the date driving wheel made of plastic?
This is a design strategy of the 8200 series: the plastic date driving wheel acts as a sacrificial component. When the owner operates the quick-set during the prohibited hours (approximately 9 PM to 4 AM), this wheel breaks before the metal corrector lever, protecting the more expensive component. If quick-date fails but quick-day still works, this part is likely the culprit.
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