---
description: Genuine TMI/Seiko VD79 day wheel for quartz movement. Calendar component restores 9 o'clock day indicator function. Japanese quality.
title: TMI/Hattori SEIKO VD79 Movement Day Wheel - Sofly
image: https://www.soflypart.com/wp-content/uploads/2019/05/VD799H.jpg
---
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- **TMI/Hattori SEIKO VD79 Movement Day Wheel**
[](https://www.soflypart.com/wp-content/uploads/2019/05/VD799H.jpg)
# TMI/Hattori SEIKO VD79 Movement Day Wheel
$1.00
You Saved
| Brand | Choose an option TMI- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $1.00 |
| 3 - 4 | 5% | $0.95 |
| 5 - 9 | 7% | $0.93 |
| 10 - 14 | 10% | $0.90 |
| 15+ | 15% | $0.85 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $1.00 |
| 3 - 4 | 5% | $0.95 |
| 5 - 9 | 7% | $0.93 |
| 10 - 14 | 10% | $0.90 |
| 15+ | 15% | $0.85 |
TMI/Hattori SEIKO VD79 Movement Day Wheel quantity
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## 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 .
## 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 **info@soflypart.com** or WhatsApp **+86 18620212114**.
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As part of the calendar mechanism, the day wheel advances the day hand to display the current day of the week\u00a0. 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\u00a0\u2013 authentic Japanese-made component for the VD79 movement Calendar mechanism component\u00a0\u2013 drives the day hand at the 9 o'clock subdial Low torque requirement\u00a0\u2013 specified for \u2264 0.05 \u03bcN\u00b7m for smooth operation\u00a0 Essential for service\u00a0\u2013 commonly replaced when day hand operation becomes irregular Specifications Compatible Movement: TMI/Seiko VD79, VD79A\u00a0 Movement Size: 10\u00bd ligne (approx. 23.3-23.7mm)\u00a0 Movement Height: 3.45mm\u00a0 Subdial Positions: Day at 9 o'clock, Date at 6 o'clock\u00a0 Hand Sizes: Hour 1.20mm / Minute 0.70mm / Sub hands 0.20mm\u00a0 Battery: 377 / SR626SW\u00a0 Stem: 351177, Tap 10\u00a0 Origin: Japan Applications Service and repair\u00a0\u2013 replacing worn or damaged day wheels in VD79 movements Calendar function restoration\u00a0\u2013 resolving issues with day hand advancement Suitable for\u00a0professional watchmakers\u00a0and\u00a0experienced repair technicians FAQs 1. Is this a genuine TMI/Seiko part? Yes, this is a\u00a0genuine Seiko (TMI) factory part\u00a0made in Japan. The VD79 is a quartz movement manufactured and distributed by Time Module Inc. (TMI)\u00a0. 2. Which movements is this day wheel compatible with? This day wheel is compatible with the\u00a0TMI/Seiko VD79 and VD79A\u00a0movements. The VD79 is a 10\u00bd ligne quartz caliber with two hands and two subdial indicators for day and date\u00a0. 3. How does the day wheel function in the movement? The day wheel is part of the\u00a0calendar mechanism\u00a0that drives the day hand at the 9 o'clock subdial. In the VD79 movement, the day indicator advances automatically when setting the time\u00a0. 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\u00a0info@soflypart.com\u00a0or WhatsApp\u00a0+86 18620212114.","image":"https://www.soflypart.com/wp-content/uploads/2019/05/VD799H-150x150.jpg","offers":{"@type":"Offer","description":"Product Description The\u00a0TMI/Seiko VD79 Movement Day Wheel\u00a0is a genuine Japanese-made component for the VD79 quartz movement\u00a0. This movement is a 10\u00bd ligne (approx. 23.3-23.7mm) caliber, featuring two subdials for\u00a0day and date indicators, typically located at 9 and 6 o'clock positions\u00a0. As part of the calendar mechanism, the day wheel advances the day hand to display the current day of the week\u00a0. 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\u00a0\u2013 authentic Japanese-made component for the VD79 movement Calendar mechanism component\u00a0\u2013 drives the day hand at the 9 o'clock subdial Low torque requirement\u00a0\u2013 specified for \u2264 0.05 \u03bcN\u00b7m for smooth operation\u00a0 Essential for service\u00a0\u2013 commonly replaced when day hand operation becomes irregular Specifications Compatible Movement: TMI/Seiko VD79, VD79A\u00a0 Movement Size: 10\u00bd ligne (approx. 23.3-23.7mm)\u00a0 Movement Height: 3.45mm\u00a0 Subdial Positions: Day at 9 o'clock, Date at 6 o'clock\u00a0 Hand Sizes: Hour 1.20mm / Minute 0.70mm / Sub hands 0.20mm\u00a0 Battery: 377 / SR626SW\u00a0 Stem: 351177, Tap 10\u00a0 Origin: Japan Applications Service and repair\u00a0\u2013 replacing worn or damaged day wheels in VD79 movements Calendar function restoration\u00a0\u2013 resolving issues with day hand advancement Suitable for\u00a0professional watchmakers\u00a0and\u00a0experienced repair technicians FAQs 1. Is this a genuine TMI/Seiko part? Yes, this is a\u00a0genuine Seiko (TMI) factory part\u00a0made in Japan. The VD79 is a quartz movement manufactured and distributed by Time Module Inc. (TMI)\u00a0. 2. Which movements is this day wheel compatible with? This day wheel is compatible with the\u00a0TMI/Seiko VD79 and VD79A\u00a0movements. The VD79 is a 10\u00bd ligne quartz caliber with two hands and two subdial indicators for day and date\u00a0. 3. How does the day wheel function in the movement? The day wheel is part of the\u00a0calendar mechanism\u00a0that drives the day hand at the 9 o'clock subdial. In the VD79 movement, the day indicator advances automatically when setting the time\u00a0. 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. 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