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The ETA 6497‑2 771 Mainspring is an original Swiss‑made OEM component for the renowned ETA/Unitas 6497‑2 hand‑wound movement, which powers numerous Panerai homage and pilot watches. Measuring 1.50 mm in height, 14.5 mm in length and 0.175 mm in thickness, it restores the movement‘s original 53‑hour power reserve and stable torque output.
As a genuine factory part, it is the definitive replacement for a worn, fatigued or broken original mainspring.
Genuine ETA OEM part – 100% authentic, Swiss made, factory‑fresh.
Optimised for 21,600 vph (3 Hz) movement – restores smooth power delivery and stable amplitude.
53‑hour power reserve – designed specifically for the high‑beat 6497‑2 manual caliber.
High‑strength alloy construction – fatigue‑resistant spring steel ensures long‑term reliability.
Drop‑in replacement – exact fit for the 6497‑2 mainspring barrel, no modification needed.
| Parameter | Value |
|---|---|
| OEM Part Number | ETA 771 / ETA 6497‑2 771 |
| Compatibility | ETA Unitas 6497‑2 (hand‑wound, 21,600 vph) |
| Mainspring Height | 1.50 mm |
| Mainspring Length | approx. 14.5 mm (540 mm unwound length) |
| Mainspring Thickness | 0.175 mm |
| Movement Diameter | 36.6 mm (16.5‴) |
| Movement Height | 4.5 mm |
| Movement Jewels | 17 |
| Power Reserve | 53 hours |
| Origin | Swiss Made |
| Condition | Brand New, Genuine OEM |
Direct replacement for a broken, fatigued or corroded original mainspring during full service of an ETA 6497‑2 movement.
Suitable for Panerai Radiomir, Luminor and homage watches, and pilot watches that use the 6497‑2 manual caliber (Panerai OP XI, Steinhart, etc.).
Professional watchmaking use; correct mainspring installation requires a mainspring winder (e.g., Bergeon 2795‑ETA) to avoid damaging the spring.
Q1: Is this a genuine ETA mainspring?
Yes, it is a 100% authentic, Swiss‑made ETA OEM component.
Q2: Which calibers is this mainspring compatible with?
It is specifically designed for the ETA Unitas 6497‑2 (21,600 vph hand‑wound caliber). Do not use it for the 6497‑1 (18,000 vph), which uses a different mainspring and arbor.
Q3: What are the signs that the mainspring needs replacement?
Symptoms include significantly reduced power reserve (well below the nominal 53 hours), low amplitude, irregular timekeeping, or the watch stopping prematurely even when fully wound.
Fast worldwide shipping within 3 business days.
Competitive pricing on Seiko/Hattori calibers.
3,000+ watch movements and parts in stock.
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