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The ETA 2824/2834/2836-771 Mainspring is a genuine Swiss-made mainspring designed for ETA 2824, 2834, and 2836 automatic movements. This essential component stores and releases energy to power the movement, ensuring reliable performance and consistent power reserve when properly installed during servicing.
Genuine ETA part – authentic Swiss-made component
Compatible with 2824/2834/2836 – versatile fit across multiple ETA calibers
Stores and releases energy – powers the movement for consistent timekeeping
Precision-engineered – manufactured to ETA’s exacting specifications
Restores power reserve – replaces worn or set mainsprings during service
Part Number: 771
Compatible Movements: ETA 2824, 2834, 2836 (automatic)
Part Type: Mainspring (barrel spring)
Origin: Switzerland (genuine ETA factory part)
Condition: Brand new
Service and overhaul of ETA 2824/2834/2836 movements
Power reserve restoration – replacing weakened or set mainsprings
Preventive maintenance – during routine service intervals
Suitable for professional watchmakers and repair technicians
1. Is this a genuine ETA part?
Yes, this is a genuine ETA factory part (reference 771), manufactured in Switzerland. It is not an aftermarket or generic component.
2. Which movements is this mainspring compatible with?
This mainspring is compatible with ETA 2824, 2834, and 2836 automatic movements. Please verify your movement caliber before ordering.
3. Is the mainspring pre-lubricated?
Genuine ETA mainsprings are typically supplied with factory lubrication for immediate installation. If unsure, check with your supplier before installation.
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