---
description: Genuine ETA 7750 mainspring (ref. 771) — Swiss made, brand new, reliable power reserve. Original ETA spare part. Genuine ETA.
title: ETA 7750-771 Mainspring - Sofly
image: https://www.soflypart.com/wp-content/uploads/2020/12/DSC05891.jpg
---
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- **ETA 7750-771 Mainspring**
[](https://www.soflypart.com/wp-content/uploads/2020/12/DSC05891.jpg)
# ETA 7750-771 Mainspring
$11.00
You Saved
| Brand | Choose an option ETA- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 | — | $11.00 |
| 2 - 4 | 5% | $10.45 |
| 5 - 9 | 7% | $10.23 |
| 10 - 14 | 12% | $9.68 |
| 15+ | 15% | $9.35 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 | — | $11.00 |
| 2 - 4 | 5% | $10.45 |
| 5 - 9 | 7% | $10.23 |
| 10 - 14 | 12% | $9.68 |
| 15+ | 15% | $9.35 |
ETA 7750-771 Mainspring quantity
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## Product Description
**Genuine ETA 7750 mainspring (part no. 771), made in Switzerland and brand new.** Engineered to deliver **reliable power reserve and consistent torque** for the legendary ETA 7750 automatic chronograph movement. An essential genuine ETA replacement component for watchmakers servicing 7750 movements — ideal for certified watchmakers and repair technicians.
## Features & Function
- **Genuine ETA mainspring** — Swiss-made, original ETA spare part (ref. 771), not a generic copy
- **For ETA 7750 movement** — precision-matched to this iconic automatic chronograph caliber
- **Reliable power delivery** — smooth, consistent torque for accurate timekeeping
- **Brand new condition** — clean, ready-to-install genuine ETA component
- **Essential movement part** — for certified watchmakers and repair technicians
## Specifications
| Parameter | Value |
| --- | --- |
| **Type** | Mainspring |
| **Brand** | ETA (genuine) |
| **Origin** | Made in Switzerland |
| **Part Number** | 771 |
| **Compatibility** | ETA caliber 7750 |
| **Condition** | Brand new |
| **Application** | Automatic chronograph movement power source |
## Applications
- Replacing worn or broken mainsprings in ETA 7750 movements
- Professional movement servicing and overhaul with genuine ETA parts
- Certified watchmaker and repair technician genuine ETA part supply
- Watch repair workshop and service center equipment
- Restoring reliable power reserve to ETA 7750 chronograph watches
## FAQ
**Q1: Is this a genuine ETA mainspring?**
A: Yes — this is a **genuine ETA 7750 mainspring (part no. 771)**, made in Switzerland. It is an original ETA spare part, not a generic or aftermarket copy.
**Q2: Which movement does it fit?**
A: This mainspring is designed for the **ETA caliber 7750** automatic chronograph movement — please confirm your movement reference before ordering.
**Q3: Is it safe to install?**
A: Yes — the mainspring is a **brand new genuine ETA component**. We recommend **professional watchmaker installation** for safe and correct fitting into the barrel.
## 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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Features & Function Genuine ETA mainspring\u00a0\u2014 Swiss-made, original ETA spare part (ref. 771), not a generic copy For ETA 7750 movement\u00a0\u2014 precision-matched to this iconic automatic chronograph caliber Reliable power delivery\u00a0\u2014 smooth, consistent torque for accurate timekeeping Brand new condition\u00a0\u2014 clean, ready-to-install genuine ETA component Essential movement part\u00a0\u2014 for certified watchmakers and repair technicians Specifications Parameter Value Type Mainspring Brand ETA (genuine) Origin Made in Switzerland Part Number 771 Compatibility ETA caliber 7750 Condition Brand new Application Automatic chronograph movement power source Applications Replacing worn or broken mainsprings in ETA 7750 movements Professional movement servicing and overhaul with genuine ETA parts Certified watchmaker and repair technician genuine ETA part supply Watch repair workshop and service center equipment Restoring reliable power reserve to ETA 7750 chronograph watches FAQ Q1: Is this a genuine ETA mainspring? A: Yes \u2014 this is a\u00a0genuine ETA 7750 mainspring (part no. 771), made in Switzerland. It is an original ETA spare part, not a generic or aftermarket copy. Q2: Which movement does it fit? A: This mainspring is designed for the\u00a0ETA caliber 7750\u00a0automatic chronograph movement \u2014 please confirm your movement reference before ordering. Q3: Is it safe to install? A: Yes \u2014 the mainspring is a\u00a0brand new genuine ETA component. We recommend\u00a0professional watchmaker installation\u00a0for safe and correct fitting into the barrel. 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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A: Yes \u2014 this is a\u00a0genuine ETA 7750 mainspring (part no. 771), made in Switzerland. It is an original ETA spare part, not a generic or aftermarket copy. Q2: Which movement does it fit? A: This mainspring is designed for the\u00a0ETA caliber 7750\u00a0automatic chronograph movement \u2014 please confirm your movement reference before ordering. Q3: Is it safe to install? A: Yes \u2014 the mainspring is a\u00a0brand new genuine ETA component. We recommend\u00a0professional watchmaker installation\u00a0for safe and correct fitting into the barrel. 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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