---
description: ETA 7750-8139 Operating Lever — Genuine ETA, fits 7750 chronograph. Original factory chronograph reset lever. Made in Switzerland. Brand new.
title: ETA 7750-8139 Operating Lever - Sofly
image: https://www.soflypart.com/wp-content/uploads/2020/07/DSC05693.jpg
---
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- **ETA 7750-8139 Operating Lever**
[](https://www.soflypart.com/wp-content/uploads/2020/07/DSC05693.jpg)
[](https://www.soflypart.com/wp-content/uploads/2020/07/DSC05694.jpg)
# ETA 7750-8139 Operating Lever
$15.00
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| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $15.00 |
| 3 - 4 | 5% | $14.25 |
| 5 - 9 | 7% | $13.95 |
| 10 - 14 | 10% | $13.50 |
| 15+ | 15% | $12.75 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $15.00 |
| 3 - 4 | 5% | $14.25 |
| 5 - 9 | 7% | $13.95 |
| 10 - 14 | 10% | $13.50 |
| 15+ | 15% | $12.75 |
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## Product Description
**Genuine ETA 7750-8139 Operating Lever**, Made in Switzerland, brand new — the **original factory mechanical lever component** for the **ETA/Valjoux 7750 chronograph movement’s reset mechanism**. Precisely engineered to **transmit reset pusher force to the chronograph recording hammer** in precise coordination with other operating levers, the Operating Lever **ensures synchronized reset of the chronograph counters** upon reset activation. An **essential replacement part** for restoring a worn or damaged operating lever during movement service. **Original ETA part** — the professional’s choice for genuine chronograph reset coordination restoration.
## Features & Function
- **Genuine ETA 7750-8139** — original Swiss-made factory part, brand new, authentic, part number 7750-8139
- **Operating lever** — transmits reset pusher force to the chronograph recording hammer for synchronized counter reset
- **Sequential reset coordination** — works in precise sequence with other operating levers to reset all chronograph counters simultaneously
- **Chronograph reset mechanism** — integral lever component in the ETA 7750 cam-switching chronograph platform
- **Original factory quality** — exact dimensional and pivot specifications for perfect fit in the ETA/Valjoux 7750 movement
## Specifications
| Parameter | Value |
| --- | --- |
| **Brand** | ETA (Swatch Group) |
| **Part Number** | 7750-8139 |
| **Component** | Operating Lever |
| **Compatibility** | ETA/Valjoux 7750 Chronograph Movement |
| **Origin** | Made in Switzerland |
| **Type** | Original Factory Part (Genuine ETA) |
| **Function** | Transmits reset pusher force to chronograph recording hammer; ensures synchronized chronograph counter reset |
| **Packing** | Original Packing |
| **Condition** | Brand New / Genuine ETA |
## Applications
- Replacement of worn, damaged, or bent Operating Lever in the ETA/Valjoux 7750 movement
- Repair of chronograph reset failures: chronograph counters not resetting, partial reset, or reset sequence misalignment
- Repair of lever mechanism: lever not engaging properly or failure to transmit reset force
- Professional movement service, overhaul, and chronograph restoration
- Certified watchmaker and service center parts supply
## FAQ
**Q1: Is this a genuine ETA part?**
A: Yes — this is a **genuine ETA 7750-8139 Operating Lever**, **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**. The **part number 7750-8139** is the specific **Operating Lever** for this movement. Common brand applications include: **IWC Portugieser Chronograph, Omega Speedmaster (older 7750 variant), Tag Heuer Monaco, Breitling Navitimer**, and many other chronographs using the Valjoux/ETA 7750 platform.
**Q3: What does the Operating Lever do?**
A: The **Operating Lever (7750-8139)** is a **mechanical lever in the chronograph reset mechanism** that **transmits the reset pusher force** to the chronograph recording hammer. When you **press the reset pusher**, the force travels through the **operating levers** to the **recording hammers**, which then strike the chronograph counters back to zero. The operating lever is the **force transmission link** between the pusher and the hammer — without it, the reset force **cannot reach the recording hammer** and the chronograph counters will not reset.
## 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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Precisely engineered to\u00a0transmit reset pusher force to the chronograph recording hammer\u00a0in precise coordination with other operating levers, the Operating Lever\u00a0ensures synchronized reset of the chronograph counters\u00a0upon reset activation. An\u00a0essential replacement part\u00a0for restoring a worn or damaged operating lever during movement service.\u00a0Original ETA part\u00a0\u2014 the professional\u2019s choice for genuine chronograph reset coordination restoration. Features & Function Genuine ETA 7750-8139\u00a0\u2014 original Swiss-made factory part, brand new, authentic, part number 7750-8139 Operating lever\u00a0\u2014 transmits reset pusher force to the chronograph recording hammer for synchronized counter reset Sequential reset coordination\u00a0\u2014 works in precise sequence with other operating levers to reset all chronograph counters simultaneously Chronograph reset mechanism\u00a0\u2014 integral lever component in the ETA 7750 cam-switching chronograph platform Original factory quality\u00a0\u2014 exact dimensional and pivot specifications for perfect fit in the ETA/Valjoux 7750 movement Specifications Parameter Value Brand ETA (Swatch Group) Part Number 7750-8139 Component Operating Lever Compatibility ETA/Valjoux 7750 Chronograph Movement Origin Made in Switzerland Type Original Factory Part (Genuine ETA) Function Transmits reset pusher force to chronograph recording hammer; ensures synchronized chronograph counter reset Packing Original Packing Condition Brand New / Genuine ETA Applications Replacement of worn, damaged, or bent Operating Lever in the ETA/Valjoux 7750 movement Repair of chronograph reset failures: chronograph counters not resetting, partial reset, or reset sequence misalignment Repair of lever mechanism: lever not engaging properly or failure to transmit reset force Professional movement service, overhaul, and chronograph restoration Certified watchmaker and service center parts supply FAQ Q1: Is this a genuine ETA part? A: Yes \u2014 this is a\u00a0genuine ETA 7750-8139 Operating Lever,\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. The\u00a0part number 7750-8139\u00a0is the specific\u00a0Operating Lever\u00a0for this movement. Common brand applications include:\u00a0IWC Portugieser Chronograph, Omega Speedmaster (older 7750 variant), Tag Heuer Monaco, Breitling Navitimer, and many other chronographs using the Valjoux/ETA 7750 platform. Q3: What does the Operating Lever do? A: The\u00a0Operating Lever (7750-8139)\u00a0is a\u00a0mechanical lever in the chronograph reset mechanism\u00a0that\u00a0transmits the reset pusher force\u00a0to the chronograph recording hammer. When you\u00a0press the reset pusher, the force travels through the\u00a0operating levers\u00a0to the\u00a0recording hammers, which then strike the chronograph counters back to zero. The operating lever is the\u00a0force transmission link\u00a0between the pusher and the hammer \u2014 without it, the reset force\u00a0cannot reach the recording hammer\u00a0and the chronograph counters will not reset. 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/DSC05693-150x150.jpg","offers":{"@type":"Offer","description":"Product Description Genuine ETA 7750-8139 Operating Lever, Made in Switzerland, brand new \u2014 the\u00a0original factory mechanical lever component\u00a0for the\u00a0ETA/Valjoux 7750 chronograph movement\u2019s reset mechanism. Precisely engineered to\u00a0transmit reset pusher force to the chronograph recording hammer\u00a0in precise coordination with other operating levers, the Operating Lever\u00a0ensures synchronized reset of the chronograph counters\u00a0upon reset activation. An\u00a0essential replacement part\u00a0for restoring a worn or damaged operating lever during movement service.\u00a0Original ETA part\u00a0\u2014 the professional\u2019s choice for genuine chronograph reset coordination restoration. Features & Function Genuine ETA 7750-8139\u00a0\u2014 original Swiss-made factory part, brand new, authentic, part number 7750-8139 Operating lever\u00a0\u2014 transmits reset pusher force to the chronograph recording hammer for synchronized counter reset Sequential reset coordination\u00a0\u2014 works in precise sequence with other operating levers to reset all chronograph counters simultaneously Chronograph reset mechanism\u00a0\u2014 integral lever component in the ETA 7750 cam-switching chronograph platform Original factory quality\u00a0\u2014 exact dimensional and pivot specifications for perfect fit in the ETA/Valjoux 7750 movement Specifications Parameter Value Brand ETA (Swatch Group) Part Number 7750-8139 Component Operating Lever Compatibility ETA/Valjoux 7750 Chronograph Movement Origin Made in Switzerland Type Original Factory Part (Genuine ETA) Function Transmits reset pusher force to chronograph recording hammer; ensures synchronized chronograph counter reset Packing Original Packing Condition Brand New / Genuine ETA Applications Replacement of worn, damaged, or bent Operating Lever in the ETA/Valjoux 7750 movement Repair of chronograph reset failures: chronograph counters not resetting, partial reset, or reset sequence misalignment Repair of lever mechanism: lever not engaging properly or failure to transmit reset force Professional movement service, overhaul, and chronograph restoration Certified watchmaker and service center parts supply FAQ Q1: Is this a genuine ETA part? A: Yes \u2014 this is a\u00a0genuine ETA 7750-8139 Operating Lever,\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. The\u00a0part number 7750-8139\u00a0is the specific\u00a0Operating Lever\u00a0for this movement. Common brand applications include:\u00a0IWC Portugieser Chronograph, Omega Speedmaster (older 7750 variant), Tag Heuer Monaco, Breitling Navitimer, and many other chronographs using the Valjoux/ETA 7750 platform. Q3: What does the Operating Lever do? A: The\u00a0Operating Lever (7750-8139)\u00a0is a\u00a0mechanical lever in the chronograph reset mechanism\u00a0that\u00a0transmits the reset pusher force\u00a0to the chronograph recording hammer. When you\u00a0press the reset pusher, the force travels through the\u00a0operating levers\u00a0to the\u00a0recording hammers, which then strike the chronograph counters back to zero. The operating lever is the\u00a0force transmission link\u00a0between the pusher and the hammer \u2014 without it, the reset force\u00a0cannot reach the recording hammer\u00a0and the chronograph counters will not reset. 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":"15","priceCurrency":"USD","availability":"http://schema.org/InStock","itemCondition":"NewCondition","priceValidUntil":"2027-12-31","url":"https://www.soflypart.com/product/eta-7750-8139-operating-lever/?attribute_pa_brand=eta"}}],"@id":"https://www.soflypart.com/product/eta-7750-8139-operating-lever/#richSnippet"}]}
```