---
description: Genuine TMI/Seiko VD78 small second wheel for quartz movement. Restores 6 o'clock subdial seconds function. Japanese quality.
title: TMI/Hattori SEIKO VD78 Movement Small Second Wheel - Sofly
image: https://www.soflypart.com/wp-content/uploads/2019/05/VD786H.jpg
---
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- **TMI/Hattori SEIKO VD78 Movement Small Second Wheel**
[](https://www.soflypart.com/wp-content/uploads/2019/05/VD786H.jpg)
# TMI/Hattori SEIKO VD78 Movement Small Second 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 VD78 Movement Small Second Wheel quantity
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## Product Description
The **TMI/Seiko VD78 Movement Small Second Wheel** is a genuine Japanese-made component for the popular VD78 quartz movement. The VD78 is a 10½ ligne (approx. 22.6mm) caliber with a slim 3.45mm height, featuring a **small seconds subdial at the 6 o’clock position** . As part of the gear train, the small second wheel drives the subdial seconds hand for accurate timekeeping . This genuine TMI/Seiko part is essential for watchmakers restoring proper small seconds function when the original component becomes worn or damaged.
## Features & Function
- **Genuine TMI/Seiko part** – authentic Japanese-made component for the VD78 movement
- **Small seconds drive** – drives the 6 o’clock subdial seconds hand for accurate timekeeping
- **Compact design** – designed for slim 3.45mm quartz movements
- **Essential for service** – commonly replaced when small seconds hand operation becomes irregular
## Specifications
- **Compatible Movement**: TMI/Seiko VD78
- **Movement Size**: 10½ ligne (approx. 22.6mm)
- **Movement Height**: 3.45mm
- **Subdial Position**: Small seconds at 6 o’clock
- **Hand Sizes**: Hour: 1.20mm / Minute: 0.70mm / Small seconds: 0.20-0.21mm
- **Battery**: 377 / SR626SW
- **Origin**: Japan
## Applications
- **Service and repair** – replacing worn or damaged small second wheels in VD78 movements
- **Gear train restoration** – ensuring smooth subdial seconds hand operation
- 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 is widely used in Invicta, Ingersoll, and other watch brands .
**2. What are the signs that the small second wheel needs replacement?**
Common signs include **small seconds hand not moving smoothly, stopping, or moving irregularly**, or **visible wear/damage** during movement inspection. A qualified watchmaker can diagnose these issues.
**3. Is professional installation required?**
Yes, small second wheel replacement requires **movement disassembly and specialized tools**. We strongly recommend installation by a **qualified watchmaker**.
## 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 gear train, the small second wheel drives the subdial seconds hand for accurate timekeeping\u00a0. This genuine TMI/Seiko part is essential for watchmakers restoring proper small seconds function when the original component becomes worn or damaged. Features & Function Genuine TMI/Seiko part\u00a0\u2013 authentic Japanese-made component for the VD78 movement Small seconds drive\u00a0\u2013 drives the 6 o'clock subdial seconds hand for accurate timekeeping Compact design\u00a0\u2013 designed for slim 3.45mm quartz movements Essential for service\u00a0\u2013 commonly replaced when small seconds hand operation becomes irregular Specifications Compatible Movement: TMI/Seiko VD78 Movement Size: 10\u00bd ligne (approx. 22.6mm)\u00a0 Movement Height: 3.45mm\u00a0 Subdial Position: Small seconds at 6 o'clock\u00a0 Hand Sizes: Hour: 1.20mm / Minute: 0.70mm / Small seconds: 0.20-0.21mm\u00a0 Battery: 377 / SR626SW\u00a0 Origin: Japan Applications Service and repair\u00a0\u2013 replacing worn or damaged small second wheels in VD78 movements Gear train restoration\u00a0\u2013 ensuring smooth subdial seconds hand operation Suitable for\u00a0professional watchmakers\u00a0and\u00a0experienced repair technicians FAQs 1. 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Personalized sourcing support via\u00a0info@soflypart.com\u00a0or WhatsApp\u00a0+86 18620212114.","image":"https://www.soflypart.com/wp-content/uploads/2019/05/VD786H-150x150.jpg","offers":{"@type":"Offer","description":"Product Description The\u00a0TMI/Seiko VD78 Movement Small Second Wheel\u00a0is a genuine Japanese-made component for the popular VD78 quartz movement. The VD78 is a 10\u00bd ligne (approx. 22.6mm) caliber with a slim 3.45mm height, featuring a\u00a0small seconds subdial at the 6 o'clock position\u00a0. As part of the gear train, the small second wheel drives the subdial seconds hand for accurate timekeeping\u00a0. This genuine TMI/Seiko part is essential for watchmakers restoring proper small seconds function when the original component becomes worn or damaged. Features & Function Genuine TMI/Seiko part\u00a0\u2013 authentic Japanese-made component for the VD78 movement Small seconds drive\u00a0\u2013 drives the 6 o'clock subdial seconds hand for accurate timekeeping Compact design\u00a0\u2013 designed for slim 3.45mm quartz movements Essential for service\u00a0\u2013 commonly replaced when small seconds hand operation becomes irregular Specifications Compatible Movement: TMI/Seiko VD78 Movement Size: 10\u00bd ligne (approx. 22.6mm)\u00a0 Movement Height: 3.45mm\u00a0 Subdial Position: Small seconds at 6 o'clock\u00a0 Hand Sizes: Hour: 1.20mm / Minute: 0.70mm / Small seconds: 0.20-0.21mm\u00a0 Battery: 377 / SR626SW\u00a0 Origin: Japan Applications Service and repair\u00a0\u2013 replacing worn or damaged small second wheels in VD78 movements Gear train restoration\u00a0\u2013 ensuring smooth subdial seconds hand operation Suitable for\u00a0professional watchmakers\u00a0and\u00a0experienced repair technicians FAQs 1. 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