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This is a genuine circuit block electronic module for the Hattori (Seiko Instruments Inc. / TMI) VK67 quartz movement. As the core electronic control unit of this Mecaquartz (mechanical-quartz hybrid) chronograph movement, the module integrates a quartz oscillator and CMOS integrated circuit, generating a precise 32,768 Hz time base frequency to drive the stepper motor. It controls the precise operation of the central hour/minute hands, small running seconds at 6:00, central chronograph seconds hand (1/5‑second steps), 60‑minute totalizer at 12:00, 12‑hour totalizer at 9:00, and the date window at 3:00.
As an original OEM replacement part, it provides a direct solution for repairing VK67 movement failures caused by water ingress, battery leakage, or aging electronic components.
Genuine Hattori / SII Part – Factory‑original from Seiko Instruments Inc. (SII) / Hattori / TMI, not a copy, ensuring perfect fit for VK67 movements.
Mecaquartz Hybrid Technology – Combines quartz timekeeping with a mechanical chronograph module, offering the precision of quartz with the tactile feel of a mechanical chronograph; the chronograph seconds hand sweeps in 1/5‑second steps.
Full Chronograph Functionality – Drives central chronograph seconds hand, 60‑minute totalizer at 12:00, 12‑hour totalizer at 9:00, small running seconds at 6:00, and date window at 3:00, with timing capability up to 12 hours.
High‑Precision Time Base – Integrated 32,768 Hz quartz oscillator with an accuracy of less than ±20 seconds per month, providing a stable and reliable time reference.
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 Movements | Hattori (SII / TMI) VK67, VK67A, VK67B; also VK68, Seiko 8T67 (branded version) |
| Movement Size | 13½‴ (30.80 mm × 29.10 mm) |
| Movement Thickness | 5.10 mm |
| Frequency | 32,768 Hz |
| Battery Type | 394 (SR936SW) |
| Battery Life | Approx. 3 years (normal use) |
| Accuracy | ±20 seconds per month (under normal temperatures) |
| Jewels | 0 |
| Hand Sizes | Hour 1.50 mm / Minute 0.90 mm / Chronograph/small seconds 0.32 mm |
| Functions | Central hour/minute, small seconds at 6:00, central chronograph seconds (1/5‑sec steps), 60‑minute totalizer at 12:00, 12‑hour totalizer at 9:00, date at 3:00 |
| Hacking Seconds | Yes (small seconds hand stops when crown is pulled) |
| Origin | Japan |
Hattori VK67, VK68 series Mecaquartz chronograph movements (commonly found in Seiko, WIRED, Vostok Europe, and many microbrand / custom watches).
Repair of non‑running movements, faulty chronograph functions, non‑advancing date, or no pulse output after battery replacement.
Particularly suitable for failures caused by water ingress, battery leakage corroding the PCB, or aged electronic components.
Professional watch workshops, brand service centers, DIY watch 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 VK67 series movements, not a third‑party copy.
2. Are the circuit boards for VK67 and VK68 interchangeable?
VK67 and VK68 are largely interchangeable at the circuit board level (the main difference is that VK68 lacks the 12‑hour totalizer). Verify the original PCB shape and contact layout before installation.
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; chronograph functions are inoperative (non‑mechanical fault); date does not advance; visible corrosion on the PCB due to moisture or battery leakage. Note: after battery replacement, if the small seconds hand moves in two‑second intervals for about 10 seconds before resuming normal one‑second steps, this is a normal circuit reset procedure and not a fault.
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