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This is a genuine MIYOTA balance wheel assembly for the 8200/8205/8215 series automatic mechanical movements, made in Japan. It serves as the core component of the timekeeping system, working with the hairspring to form a harmonic oscillator that oscillates at 21,600 beats per hour (3Hz) , controlling the even 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 Movements：8200 / 8205 / 8215 and 8200 series (including 8200A, 8200C, 8203, 8210A, 82S7, 8N24)
Part Name：Balance Complete (Balance Wheel with Hairspring)
Part Number：039-1020 (Citizen original part number)
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Controls energy release, works with hairspring for accurate timekeeping
1. Is this balance wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part with part number 039-1020, made in Japan.
2. Which movements is this balance wheel compatible with?
It fits MIYOTA 8200/8205/8215 series automatic movements, as well as 8200A, 8200C, 8203, 8210A, 8228A, 8234A, 8260A, 8277A, 8278A, 8279A, 82S7, 8N24, and other series models. The 8205 is the day-date version, while the 8215 is date-only—the balance wheel assembly is common across both.
3. What happens if the balance wheel is damaged?
The balance wheel is the core component determining timekeeping accuracy, with its oscillation frequency (21,600 bph) directly affecting precision. Damage can cause stoppage, severe timekeeping errors, or abnormal amplitude. The 8200 series features Parashock shock protection for the balance staff, but strong impacts may still cause damage.
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