---
description: Genuine ETA 7750-423 Crown Wheel Core — Made in Switzerland, fits ETA/Valjoux 7750 chronograph. Original factory part for winding mechanism repair. Genuine. Brand new.
title: ETA 7750-423 Crown Wheel Core - Sofly
image: https://www.soflypart.com/wp-content/uploads/2020/07/DSC05739.jpg
---
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- **ETA 7750-423 Crown Wheel Core**
[](https://www.soflypart.com/wp-content/uploads/2020/07/DSC05739.jpg)
# ETA 7750-423 Crown Wheel Core
$8.00
You Saved
| Brand | Choose an option ETA- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $8.00 |
| 3 - 4 | 5 % | $7.60 |
| 5 - 9 | 7 % | $7.44 |
| 10 - 14 | 10 % | $7.20 |
| 15+ | 15 % | $6.80 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $8.00 |
| 3 - 4 | 5 % | $7.60 |
| 5 - 9 | 7 % | $7.44 |
| 10 - 14 | 10 % | $7.20 |
| 15+ | 15 % | $6.80 |
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## Product Description
**Genuine ETA 7750-423 Crown Wheel Core**, Made in Switzerland, brand new — the **original factory component** for the **ETA/Valjoux 7750 chronograph movement** winding mechanism. Precisely engineered to **engage with the castle wheel during manual winding**, the crown wheel core **transmits rotational torque** from the crown to the movement’s mainspring barrel. An **essential replacement part** for restoring worn or damaged crown wheel components during movement service. **Original ETA part** — the professional’s choice for genuine movement restoration.
## Features & Function
- **Genuine ETA 7750-423** — original Swiss-made factory part, brand new, authentic, part number 7750-423
- **Crown wheel core** — central hub component of the winding mechanism, responsible for torque transmission from the crown to the mainspring barrel
- **Precise gear engagement** — machined to exact tolerances for smooth, reliable meshing with the castle wheel during winding
- **Original factory quality** — exact dimensional specifications for perfect fit in the ETA/Valjoux 7750 movement
- **Critical winding component** — essential for both manual winding and automatic rotor engagement in the 7750 platform
## Specifications
| Parameter | Value |
| --- | --- |
| **Brand** | ETA (Swatch Group) |
| **Part Number** | 7750-423 |
| **Component** | Crown Wheel Core |
| **Compatibility** | ETA/Valjoux 7750 Chronograph Movement |
| **Origin** | Made in Switzerland |
| **Type** | Original Factory Part (Genuine ETA) |
| **Function** | Transmits winding torque from crown to mainspring barrel via castle wheel engagement |
| **Packing** | Original Packing |
| **Condition** | Brand New / Genuine ETA |
## Applications
- Replacement of worn, damaged, or stripped crown wheel core in the ETA/Valjoux 7750 movement
- Professional movement service, overhaul, and chronograph restoration
- Certified watchmaker and service center parts supply
- Restoration of 7750-based chronograph movements (IWC, Omega, Tag Heuer, Breitling, and other brands using 7750)
- Repair of winding mechanism failures: grinding, slipping, or failure to engage
## FAQ
**Q1: Is this a genuine ETA part?**
A: Yes — this is a **genuine ETA 7750-423 Crown Wheel Core**, **Made in Switzerland**, brand new. It is an **original factory part** from ETA (Swatch Group), the world’s leading movement manufacturer. Not a generic or replica part.
**Q2: How do I confirm this part fits my movement?**
A: Confirm your movement is an **ETA/Valjoux 7750 chronograph** (or compatible derivative). The **part number 7750-423** is the specific **crown wheel core** for this movement. Common brand applications include: **IWC Portugieser Chronograph, Omega Speedmaster (older), Tag Heuer Monaco, Breitling Navitimer**, and many other chronographs using the Valjoux/ETA 7750 platform.
**Q3: What is a crown wheel core?**
A: The **crown wheel core** is the **central hub/body of the crown wheel assembly** — the component that **engages with the castle wheel** when manually winding the watch. It **transmits rotational torque** from the crown through the clutch system to the **mainspring barrel**. A damaged or worn crown wheel core causes **winding failure**: grinding, slipping, or inability to tension the mainspring.
## 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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An\u00a0essential replacement part\u00a0for restoring worn or damaged crown wheel components during movement service.\u00a0Original ETA part\u00a0\u2014 the professional\u2019s choice for genuine movement restoration. Features & Function Genuine ETA 7750-423\u00a0\u2014 original Swiss-made factory part, brand new, authentic, part number 7750-423 Crown wheel core\u00a0\u2014 central hub component of the winding mechanism, responsible for torque transmission from the crown to the mainspring barrel Precise gear engagement\u00a0\u2014 machined to exact tolerances for smooth, reliable meshing with the castle wheel during winding Original factory quality\u00a0\u2014 exact dimensional specifications for perfect fit in the ETA/Valjoux 7750 movement Critical winding component\u00a0\u2014 essential for both manual winding and automatic rotor engagement in the 7750 platform Specifications Parameter Value Brand ETA (Swatch Group) Part Number 7750-423 Component Crown Wheel Core Compatibility ETA/Valjoux 7750 Chronograph Movement Origin Made in Switzerland Type Original Factory Part (Genuine ETA) Function Transmits winding torque from crown to mainspring barrel via castle wheel engagement Packing Original Packing Condition Brand New / Genuine ETA Applications Replacement of worn, damaged, or stripped crown wheel core in the ETA/Valjoux 7750 movement Professional movement service, overhaul, and chronograph restoration Certified watchmaker and service center parts supply Restoration of 7750-based chronograph movements (IWC, Omega, Tag Heuer, Breitling, and other brands using 7750) Repair of winding mechanism failures: grinding, slipping, or failure to engage FAQ Q1: Is this a genuine ETA part? A: Yes \u2014 this is a\u00a0genuine ETA 7750-423 Crown Wheel Core,\u00a0Made in Switzerland, brand new. It is an\u00a0original factory part\u00a0from ETA (Swatch Group), the world\u2019s leading movement manufacturer. Not a generic or replica part. Q2: How do I confirm this part fits my movement? A: Confirm your movement is an\u00a0ETA/Valjoux 7750 chronograph\u00a0(or compatible derivative). The\u00a0part number 7750-423\u00a0is the specific\u00a0crown wheel core\u00a0for this movement. Common brand applications include:\u00a0IWC Portugieser Chronograph, Omega Speedmaster (older), Tag Heuer Monaco, Breitling Navitimer, and many other chronographs using the Valjoux/ETA 7750 platform. Q3: What is a crown wheel core? A: The\u00a0crown wheel core\u00a0is the\u00a0central hub/body of the crown wheel assembly\u00a0\u2014 the component that\u00a0engages with the castle wheel when manually winding the watch. It\u00a0transmits rotational torque\u00a0from the crown through the clutch system to the\u00a0mainspring barrel. A damaged or worn crown wheel core causes\u00a0winding failure: grinding, slipping, or inability to tension the mainspring. 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/2020/07/DSC05739-150x150.jpg","offers":{"@type":"Offer","description":"Product Description Genuine ETA 7750-423 Crown Wheel Core, Made in Switzerland, brand new \u2014 the\u00a0original factory component\u00a0for the\u00a0ETA/Valjoux 7750 chronograph movement\u00a0winding mechanism. Precisely engineered to\u00a0engage with the castle wheel during manual winding, the crown wheel core\u00a0transmits rotational torque\u00a0from the crown to the movement\u2019s mainspring barrel. An\u00a0essential replacement part\u00a0for restoring worn or damaged crown wheel components during movement service.\u00a0Original ETA part\u00a0\u2014 the professional\u2019s choice for genuine movement restoration. Features & Function Genuine ETA 7750-423\u00a0\u2014 original Swiss-made factory part, brand new, authentic, part number 7750-423 Crown wheel core\u00a0\u2014 central hub component of the winding mechanism, responsible for torque transmission from the crown to the mainspring barrel Precise gear engagement\u00a0\u2014 machined to exact tolerances for smooth, reliable meshing with the castle wheel during winding Original factory quality\u00a0\u2014 exact dimensional specifications for perfect fit in the ETA/Valjoux 7750 movement Critical winding component\u00a0\u2014 essential for both manual winding and automatic rotor engagement in the 7750 platform Specifications Parameter Value Brand ETA (Swatch Group) Part Number 7750-423 Component Crown Wheel Core Compatibility ETA/Valjoux 7750 Chronograph Movement Origin Made in Switzerland Type Original Factory Part (Genuine ETA) Function Transmits winding torque from crown to mainspring barrel via castle wheel engagement Packing Original Packing Condition Brand New / Genuine ETA Applications Replacement of worn, damaged, or stripped crown wheel core in the ETA/Valjoux 7750 movement Professional movement service, overhaul, and chronograph restoration Certified watchmaker and service center parts supply Restoration of 7750-based chronograph movements (IWC, Omega, Tag Heuer, Breitling, and other brands using 7750) Repair of winding mechanism failures: grinding, slipping, or failure to engage FAQ Q1: Is this a genuine ETA part? 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It\u00a0transmits rotational torque\u00a0from the crown through the clutch system to the\u00a0mainspring barrel. A damaged or worn crown wheel core causes\u00a0winding failure: grinding, slipping, or inability to tension the mainspring. 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.","price":"8","priceCurrency":"USD","availability":"http://schema.org/InStock","itemCondition":"NewCondition","priceValidUntil":"2027-12-31","url":"https://www.soflypart.com/product/eta-7750-423-crown-wheel-core/?attribute_pa_brand=eta"}}],"@id":"https://www.soflypart.com/product/eta-7750-423-crown-wheel-core/#richSnippet"}]}
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