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This is a genuine MIYOTA balance wheel for the 6T51 movement, made in Japan, designed for the 6T51 automatic mechanical caliber. It serves as the core regulating component of the movement, working with the hairspring to form a harmonic oscillator that oscillates at 28,800 beats per hour (4Hz) , precisely controlling the release of mainspring energy as the key determinant of timekeeping accuracy. This product is brand new and original, not a generic replacement part.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：6T51 automatic caliber (including 6T51 Gilt version)
Part Name：Balance Complete (Balance Wheel with Hairspring)
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Forms harmonic oscillator with hairspring, controls energy release for accurate timekeeping
1. Is this balance wheel an original MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan. The 6T51 is a compact automatic mechanical caliber produced by Citizen’s MIYOTA division.
2. Which movements is this balance wheel compatible with?
It fits the MIYOTA 6T51 automatic mechanical caliber (8¾ ligne, 19.80mm diameter, 5.98mm height). The 6T51 is a 3-hand day-date movement (day/date at 3 o’clock), available in a Gilt (gold-tone) version—the balance wheel is common to both.
3. What happens if the balance wheel is damaged?
The balance wheel is the core regulating component of the movement’s timing system. Its oscillation frequency (28,800 bph) directly impacts timekeeping accuracy. Damage can cause stoppage, severe timekeeping errors, or abnormal amplitude. The movement offers accuracy of -20/+40 sec/day—if the watch exhibits timekeeping errors or stoppage, have a professional watchmaker inspect the balance wheel.
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