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This is a genuine TMI/Seiko VD53 movement coil block (Red/Green), made in Japan, designed for the VD53 multifunction quartz chronograph movement. It serves as the core drive component, converting electrical pulses from the circuit board into magnetic force to drive the stepper motor for hour, minute, and second hand timekeeping, along with 24-hour at 3H, 60-second small seconds at 6H, and 60-minute chronograph totalizer at 9H. This product is brand new and original, intended for servicing and repair of VD53/VD53A/VD53B/VD53C variant movements.
Brand：TMI / Seiko Instruments Inc. (by Seiko Time Corp.)
Compatible Movement：VD53 / VD53A / VD53B / VD53C quartz chronograph caliber
Part Name：Coil Block
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Converts electrical pulses to magnetic force to drive stepper motor
1. Is this coil block an original Seiko genuine part?
Yes. It is an original TMI/Seiko factory part, made in Japan.
2. Which movements is this coil block compatible with?
It fits the TMI/Seiko VD53 series chronograph movements (12¾ ligne, Ø29.50mm, 4.57mm thickness), including VD53, VD53A, VD53B, VD53C variants. This is a 3-hand chronograph movement featuring 24-hour at 3H, small seconds at 6H, 60-minute totalizer at 9H, and date display.
3. What happens if the coil block is damaged?
The coil block is the core drive component of the stepper motor. Common symptoms include: movement not running after battery replacement, noticeable time gain/loss, or intermittent stoppage. Additionally, if the coil is accidentally nicked or damaged during battery replacement, the movement may be permanently disabled—often requiring complete movement or coil module replacement. Timely replacement is recommended.
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