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This is a genuine TMI/Seiko VX12 movement coil block, made in Japan, designed for the VX12 quartz caliber. It serves as the core drive component, generating the precise 32,768Hz quartz oscillation signal to drive the stepper motor for hour, minute, and second hand timekeeping with date display at 3 o’clock. This product is brand new and original, intended for servicing and repair of VX12 movements.
Brand：TMI / Seiko Instruments Inc. (by Seiko Time Corp.)
Compatible Movement：VX12 quartz caliber
Part Name：Coil Block (Circuit Board Assembly)
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Generates and processes time signals, drives stepper motor
1. Is this coil block an original TMI/Seiko genuine part?
Yes. It is an original TMI (Seiko Instruments Inc.) factory part, made in Japan.
2. Which movements is this coil block compatible with?
It fits the TMI/Seiko VX12 quartz caliber (8¾ ligne, 18.00×20.00mm). This is a 3-hand with date movement (date at 3 o’clock) featuring hacking seconds. The VX12 is interchangeable with Seiko 7N12 and other equivalent calibers.
3. What happens if the coil block is damaged?
The coil block is the core drive component of the movement, generating the precise quartz oscillation signal and driving the motor. Damage can cause stoppage or inaccurate timekeeping, and the date may fail to advance. The VX12 battery lasts approximately 36 months—coil failure directly impacts timekeeping. Timely replacement is recommended.
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