TMI/Hattori SEIKO VD78 Movement Hour Wheel

Product Description

The TMI/Seiko VD78 Movement Hour Wheel is a genuine Japanese-made component for the VD78 quartz movement. This movement is a 10½ ligne (approx. 22.6mm) caliber featuring a small seconds subdial at the 6 o’clock position. As part of the motion work, the hour wheel works with the minute wheel to drive the hour hand for accurate time display. This genuine TMI/Seiko part is essential for watchmakers restoring proper timekeeping function when the original component becomes worn or damaged.

Features & Function

• Genuine TMI/Seiko part – authentic Japanese-made component for the VD78 movement

• Motion work component – works with the minute wheel to drive the hour hand for accurate timekeeping

• Compact design – designed for slim 3.45mm quartz movements

• Essential for service – commonly replaced when hour hand operation becomes irregular

Specifications

• Compatible Movement: TMI/Seiko VD78

• Movement Size: 10½ ligne (approx. 22.6mm)

• Movement Height: 3.45mm

• Hour Wheel Height: 1.12mm over dial seat

• Hand Sizes: Hour: 1.20mm / Minute: 0.70mm / Small seconds: 0.21mm

• Subdial Position: Small seconds at 6 o’clock

• Battery: 377 / SR626SW

• Origin: Japan

Applications

• Service and repair – replacing worn or damaged hour wheels in VD78 movements

• Motion work restoration – ensuring smooth and accurate hand alignment

• Suitable for professional watchmakers and experienced repair technicians

FAQs

1. Is this a genuine TMI/Seiko part?

Yes, this is a genuine Seiko (TMI) factory part made in Japan. The VD78 is a quartz movement manufactured by Time Module Inc. (TMI) and used in many watch brands.

2. What is the function of the hour wheel?

The hour wheel is part of the motion work that drives the hour hand. In the VD78 movement, it works with the minute wheel to ensure accurate time display, with the small seconds hand located at the 6 o’clock subdial.

3. What are the signs that the hour wheel needs replacement?

Common signs include hour hand not advancing correctly, misalignment between hour and minute hands, or visible wear/damage during inspection. A qualified watchmaker can diagnose these issues.

Why Choose SOFLY Watch Parts?

• Fast worldwide shipping within 3 business days.

• Competitive pricing on Seiko/Hattori calibers.

• 3,000+ watch movements and parts in stock.

• Trusted by watchmakers worldwide.

• Personalized sourcing support via [email protected] or WhatsApp +86 18620212114.