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The ETA 2671-728 Movement Balance Axle is a genuine Swiss-made component for the ETA 2671 automatic movement family. As the central pivot of the balance wheel assembly, the balance axle (or balance staff) is a critical part of the regulating system. It serves as the axis around which the balance wheel oscillates, allowing the hairspring to control the release of energy from the gear train and maintain accurate timekeeping .
Genuine ETA part – authentic Swiss-made component for the ETA 2671 and compatible calibers
Balance staff – central pivot for the balance wheel, enabling oscillation
Critical for timekeeping – directly affects amplitude and rate stability
Shock-absorber compatible – designed for use with Incabloc shock protection system
Direct replacement – drop-in replacement for broken or worn balance staffs
Part Number: 2671-728 / 728
Compatible Movements: ETA 2671 (also used in Movado 485, Longines 561.1, and other calibers based on ETA 2671)
Balance Staff Reference: U3519
Shock Protection: Incabloc system
Movement Diameter: 17.2 mm (7¾”’)
Movement Height: 4.80 mm
Jewels: 17/21/25 (varies by version)
Frequency: 28,800 vph (4 Hz)
Power Reserve: ~38–39 hours
Origin: Switzerland (ETA factory part)
Condition: Brand new
Service and overhaul of ETA 2671 and compatible movements
Balance staff replacement – replacing broken, bent, or worn pivots
Timekeeping restoration – restoring correct amplitude and rate when balance staff is damaged
Suitable for professional watchmakers and experienced repair technicians
1. Is this a genuine ETA part?
Yes, this is a genuine ETA factory part (reference 2671-728), made in Switzerland. It is listed in official caliber documentation as the balance staff for ETA 2671 and compatible movements .
2. Which movements is this balance axle compatible with?
This balance axle is specifically designed for the ETA 2671 movement, a 17.2 mm automatic caliber widely used in ladies’ watches. It is also compatible with calibers based on the ETA 2671, including Movado 485 and Longines 561.1 . The balance staff reference is U3519 .
3. What is the function of the balance staff?
The balance staff is the central axle of the balance wheel. It allows the balance to oscillate freely and precisely, which is fundamental to the movement’s timekeeping accuracy. A broken or bent staff will cause erratic rate or complete stoppage. Along with the hairspring, the balance wheel and staff form a harmonic oscillator that regulates the gear train’s pace .
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