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This is a genuine MIYOTA second wheel for the 8217 movement, made in Japan, designed for the 8217 automatic caliber. It serves as the key output component of the timekeeping system, transmitting power to the central seconds hand. This product is brand new and original, not a generic replacement part.
1. Is this second wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part with part number 023-940, made in Japan. The 8217 features 24-hour display and quick date setting within the 8200 series.
2. Which movements is this second wheel compatible with?
It fits the MIYOTA 8217 automatic caliber. The 8217 is a date movement with a 24-hour display at 9 o’clock, featuring automatic/hand winding and hacking. Verify your movement main plate is marked 8217 before installation.
3. What happens if the second wheel is damaged?
A damaged second wheel can cause the seconds hand to stop, wobble, or jam. The 8200 series uses an indirect seconds design, which is known for some inherent wobble or pause characteristics (the hand may pause up to 2 seconds if struck). Damaged parts will worsen this issue—timely replacement is recommended.
4. Does this part come with installation tools or instructions?
No. This is a single precision component. Installation requires professional tools; work should be performed by a qualified watchmaker.
5. How can I confirm this part fits my movement?
Check the caliber marking on the movement main plate for 8217. The part number is 023-940. Perform a visual comparison with your old part (tooth profile, arbor diameter, etc.).
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