---
description: Genuine ETA 7750-410 winding pinion for Valjoux 7750. Swiss-made keyless works part for automatic chronograph movement repair.
title: ETA 7750-410 Movement Winding Pinion | ETA Movement Parts - Sofly
image: https://www.soflypart.com/wp-content/uploads/2019/06/7750wp.jpg
---
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- **ETA 7750-410 Winding Pinion**
[](https://www.soflypart.com/wp-content/uploads/2019/06/7750wp.jpg)
[](https://www.soflypart.com/wp-content/uploads/2019/06/7750wpb.jpg)
# ETA 7750-410 Winding Pinion
$7.00
You Saved
| Brand | Choose an option ETA- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $7.00 |
| 3 - 4 | 5% | $6.65 |
| 5 - 9 | 7% | $6.51 |
| 10 - 14 | 10% | $6.30 |
| 15+ | 15% | $5.95 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $7.00 |
| 3 - 4 | 5% | $6.65 |
| 5 - 9 | 7% | $6.51 |
| 10 - 14 | 10% | $6.30 |
| 15+ | 15% | $5.95 |
ETA 7750-410 Winding Pinion quantity
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## Product Description
The **ETA 7750-410 Winding Pinion** is a genuine Swiss-made replacement component for the ETA/Valjoux 7750 automatic chronograph movement. As part of the keyless works mechanism, this winding pinion transfers manual winding motion from the crown to the mainspring, enabling the movement to be wound for its **42–48 hour power reserve**. It is a critical part to replace when a winding pinion shows wear, broken teeth, or difficulty engaging during manual winding.
## Features & Function
- **Genuine ETA/Valjoux part** – authentic Swiss-made component for the ETA 7750 movement
- **Keyless works component** – transmits manual winding power from the crown to the mainspring
- **Essential for winding function** – enables manual winding to maintain the 42–48 hour power reserve
- **Direct replacement** – drop-in replacement for worn or damaged winding pinions
- **Precision-engineered** – manufactured to ETA’s original specifications for correct fit and function
## Specifications
- **Part Number**: 7750-410 / ETA7750.410
- **Compatible Movement**: ETA/Valjoux 7750
- **Movement Diameter**: 30.0 mm
- **Movement Height**: 7.9 mm
- **Jewels**: 25
- **Frequency**: 28,800 vph (4 Hz)
- **Power Reserve**: 42–48 hours
- **Origin**: Switzerland (ETA factory part)
- **Condition**: Brand new
## Applications
- **Service and overhaul** of ETA/Valjoux 7750 movements
- **Keyless works repair** – replacing worn or damaged winding pinions
- **Winding function restoration** – enabling smooth manual winding operation
- Suitable for **professional watchmakers** and **experienced repair technicians**
## FAQs
**1. Is this a genuine ETA part?**
Yes, this is a **genuine ETA factory part** (reference 7750-410), made in Switzerland. It is not an aftermarket or generic component.
**2. Which movement is this winding pinion compatible with?**
This winding pinion is specifically designed for the **ETA/Valjoux 7750** automatic chronograph movement.
**3. What are the signs that the winding pinion needs replacement?**
Common signs include **difficulty turning the crown, rough winding feel, clicking sounds during winding, or visible wear/damage** to the teeth during inspection.
## 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 keyless works mechanism, this winding pinion transfers manual winding motion from the crown to the mainspring, enabling the movement to be wound for its\u00a042\u201348 hour power reserve. It is a critical part to replace when a winding pinion shows wear, broken teeth, or difficulty engaging during manual winding. Features & Function Genuine ETA/Valjoux part\u00a0\u2013 authentic Swiss-made component for the ETA 7750 movement Keyless works component\u00a0\u2013 transmits manual winding power from the crown to the mainspring Essential for winding function\u00a0\u2013 enables manual winding to maintain the 42\u201348 hour power reserve Direct replacement\u00a0\u2013 drop-in replacement for worn or damaged winding pinions Precision-engineered\u00a0\u2013 manufactured to ETA's original specifications for correct fit and function Specifications Part Number: 7750-410 / ETA7750.410 Compatible Movement: ETA/Valjoux 7750 Movement Diameter: 30.0 mm Movement Height: 7.9 mm Jewels: 25 Frequency: 28,800 vph (4 Hz) Power Reserve: 42\u201348 hours Origin: Switzerland (ETA factory part) Condition: Brand new Applications Service and overhaul\u00a0of ETA/Valjoux 7750 movements Keyless works repair\u00a0\u2013 replacing worn or damaged winding pinions Winding function restoration\u00a0\u2013 enabling smooth manual winding 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/2019/06/7750wp-150x150.jpg","offers":{"@type":"Offer","description":"Product Description The\u00a0ETA 7750-410 Winding Pinion\u00a0is a genuine Swiss-made replacement component for the ETA/Valjoux 7750 automatic chronograph movement. As part of the keyless works mechanism, this winding pinion transfers manual winding motion from the crown to the mainspring, enabling the movement to be wound for its\u00a042\u201348 hour power reserve. It is a critical part to replace when a winding pinion shows wear, broken teeth, or difficulty engaging during manual winding. Features & Function Genuine ETA/Valjoux part\u00a0\u2013 authentic Swiss-made component for the ETA 7750 movement Keyless works component\u00a0\u2013 transmits manual winding power from the crown to the mainspring Essential for winding function\u00a0\u2013 enables manual winding to maintain the 42\u201348 hour power reserve Direct replacement\u00a0\u2013 drop-in replacement for worn or damaged winding pinions Precision-engineered\u00a0\u2013 manufactured to ETA's original specifications for correct fit and function Specifications Part Number: 7750-410 / ETA7750.410 Compatible Movement: ETA/Valjoux 7750 Movement Diameter: 30.0 mm Movement Height: 7.9 mm Jewels: 25 Frequency: 28,800 vph (4 Hz) Power Reserve: 42\u201348 hours Origin: Switzerland (ETA factory part) Condition: Brand new Applications Service and overhaul\u00a0of ETA/Valjoux 7750 movements Keyless works repair\u00a0\u2013 replacing worn or damaged winding pinions Winding function restoration\u00a0\u2013 enabling smooth manual winding operation Suitable for\u00a0professional watchmakers\u00a0and\u00a0experienced repair technicians FAQs 1. 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