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This is a genuine MIYOTA/CITIZEN JS25 long coil block, an original Japanese-made electronic component for the JS25 meca-quartz chronograph movement. The coil block is the core of the movement‘s motor system, generating precise electromagnetic impulses to drive the stepper motor that powers the timekeeping and chronograph functions. This brand new original part is essential for restoring proper movement function when the original coil becomes damaged or fails.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：JS25 meca-quartz chronograph caliber
Part Name：Long Coil Block
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Generates electromagnetic impulses to drive the stepper motor, powering timekeeping and chronograph functions
1. Is this coil block an original MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan.
2. Which movements is this coil block compatible with?
It fits the MIYOTA JS25 chronograph movement (JS05/JS15/JS25 series). This is a multi-function chronograph movement featuring chronograph (30min/sec), 24-hour display, and date. Verify your movement caliber is JS25—the long coil and short coil versions are not interchangeable.
3. What are the typical symptoms of coil damage?
The coil block is the core drive component of the stepper motor. Common symptoms include: movement not running after battery replacement, seconds hand jumping irregularly (e.g., 2- or 4-second intervals), chronograph functions not working properly, or the movement not running at all. Timely replacement is recommended.
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