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This is a genuine circuit block electronic module for the Hattori (Seiko Instruments Inc. / TMI) VD78 quartz movement, designed for the VD78 series three‑hand with small seconds compact quartz caliber. The module integrates a quartz oscillator and CMOS integrated circuit, generating a precise 32,768 Hz time base frequency to drive the stepper motor for accurate hour, minute, and small seconds hand movement (small seconds at 6:00).
As an original OEM replacement part, it provides a direct solution for repairing VD78 movement failures caused by water ingress, battery leakage, or aging electronic components.
Genuine Hattori / SII Part – Japanese factory‑original from Seiko Instruments Inc. (SII) / Hattori / TMI, not a copy, ensuring perfect fit for VD78 movements.
High‑Precision Time Base – Integrated 32,768 Hz quartz oscillator provides a stable and reliable time reference.
Small Seconds at 6:00 – Features an independent small seconds hand at the 6 o‘clock position, distinguishing it from standard three‑hand movements.
Low‑Power CMOS Circuit – With a 377 (SR626SW) battery, typical battery life is 2‑3 years.
Cost‑Effective Repair – Replaces only the faulty circuit board instead of the entire movement, offering significant cost savings.
| Parameter | Details |
|---|---|
| Part Name | Circuit Block / Electronic Module |
| Compatible Movement | Hattori (SII / TMI) VD78 quartz |
| Movement Size | 10½‴ (outer diameter approx. 22.60 mm / 23.3 mm) |
| Movement Height | 3.45 mm |
| Overall Height (with minute pinion) | Approx. 5.0 mm |
| Frequency | 32,768 Hz |
| Battery Type | 377 (SR626SW) |
| Functions | Hour, minute, small seconds at 6:00 |
| Hand Hole Sizes | Hour Ø1.20 mm / Minute Ø0.70 mm / Small seconds Ø0.20‑0.21 mm |
| Jewels | 0 |
| Origin | Japan |
| Condition | Brand new, genuine |
Hattori VD78 quartz movements (commonly found in Seiko, Lorus, Pulsar small‑seconds watches, as well as fashion watches and custom builds).
Repair of non‑running movements, inaccurate timekeeping, abnormal seconds hand stepping, or no response after battery replacement.
Particularly suitable for failures caused by water ingress, battery leakage corroding the PCB, or aged electronic components.
Professional watch workshops, DIY enthusiasts.
1. Is this a genuine Hattori / Seiko circuit board?
Yes. It is a Japanese factory‑original part from Seiko Instruments Inc. (SII) / Hattori / TMI for the VD78 movement, not a third‑party copy.
2. Which movement models is this VD78 circuit board primarily compatible with?
This circuit board is specifically designed for the VD78 movement, a 10½‴ quartz caliber with a thickness of 3.45mm, featuring hour, minute, and a small seconds hand at 6 o‘clock. It is commonly used in Seiko, Lorus, Pulsar, and other small‑seconds watches. The VD77 (two‑eye chronograph) and VD79 (two‑eye chronograph) use different circuit boards and are not interchangeable.
3. How can I tell if the circuit board needs replacement?
Symptoms: the movement does not run with a fresh battery; no pulse output detected on a timing machine; abnormal seconds hand stepping (e.g., jumping two seconds or stopping); visible corrosion on the PCB due to moisture or battery leakage.
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