TMI/Hattori SEIKO VD79 Movement Day Wheel

Product Description

The TMI/Seiko VD79 Movement Day Wheel is a genuine Japanese-made component for the VD79 quartz movement . This movement is a 10½ ligne (approx. 23.3-23.7mm) caliber, featuring two subdials for day and date indicators, typically located at 9 and 6 o’clock positions . As part of the calendar mechanism, the day wheel advances the day hand to display the current day of the week . This genuine TMI/Seiko part is essential for watchmakers restoring proper calendar function when the original component becomes worn or damaged.

Features & Function

• Genuine TMI/Seiko part – authentic Japanese-made component for the VD79 movement

• Calendar mechanism component – drives the day hand at the 9 o’clock subdial

• Low torque requirement – specified for ≤ 0.05 μN·m for smooth operation 

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

Specifications

• Compatible Movement: TMI/Seiko VD79, VD79A 

• Movement Size: 10½ ligne (approx. 23.3-23.7mm) 

• Movement Height: 3.45mm 

• Subdial Positions: Day at 9 o’clock, Date at 6 o’clock 

• Hand Sizes: Hour 1.20mm / Minute 0.70mm / Sub hands 0.20mm 

• Battery: 377 / SR626SW 

• Stem: 351177, Tap 10 

• Origin: Japan

Applications

• Service and repair – replacing worn or damaged day wheels in VD79 movements

• Calendar function restoration – resolving issues with day hand advancement

• 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 VD79 is a quartz movement manufactured and distributed by Time Module Inc. (TMI) .

2. Which movements is this day wheel compatible with?

This day wheel is compatible with the TMI/Seiko VD79 and VD79A movements. The VD79 is a 10½ ligne quartz caliber with two hands and two subdial indicators for day and date .

3. How does the day wheel function in the movement?

The day wheel is part of the calendar mechanism that drives the day hand at the 9 o’clock subdial. In the VD79 movement, the day indicator advances automatically when setting the time .

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