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This is a genuine MIYOTA coil block for the 9U13 movement, made in Japan, designed for the 9U13 ultra-thin quartz caliber. It serves as the core drive component of the stepper motor, converting electrical pulses from the circuit board into magnetic force to drive the gear train. This product is brand new and original, intended for servicing and repair of 9U13 movements.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：9U13 ultra-thin quartz caliber
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Converts electrical pulses to magnetic force for stepper motor
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 9U13 ultra-thin quartz caliber (10½ ligne, 21.50×23.70mm, 2.33mm height). This is a 3-hand with date movement with date window at 3 o’clock (a 6 o’clock variant is also available).
3. What are the symptoms of coil block failure?
The coil block is the core drive component of the stepper motor. Common symptoms include: movement not running after battery replacement. The 9U13 offers accuracy of ±20 seconds/month with approximately 4 years of battery life. A seconds hand jumping every 2 seconds indicates low battery (EOL indicator). Timely replacement is recommended.
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