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The ETA 7750-728 Movement Balance Axle is a genuine Swiss-made component for the ETA/Valjoux 7750 automatic chronograph movement. Known as the balance staff, this axle is the central pivot for the balance wheel, enabling its oscillation and playing a crucial role in timekeeping accuracy . This brand new original part is essential for watchmakers to restore correct amplitude and precision timing when the original balance staff becomes broken or worn.
Genuine ETA part – authentic Swiss-made component for the ETA 7750 movement
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: 7750-728
Compatible Movements: ETA/Valjoux 7750, 7751, 7753, 7754, 7760, 7765
Part Type: Balance staff (balance axle) for shock-absorber and annular balance
Caliber Diameter: 30.0 mm (13¼”’)
Caliber Height: 7.9 mm
Jewels: 25
Frequency: 28,800 vph (4 Hz)
Lift Angle: 49°
Power Reserve: ~42–48 hours
Shock Protection: Incabloc system
Origin: Switzerland (ETA factory part)
Condition: Brand new
Service and overhaul of ETA 7750-series 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 7750-728), made in Switzerland. It is not an aftermarket or generic copy .
2. Which movements is this balance axle compatible with?
This balance axle is compatible with the ETA/Valjoux 7750 and its variants, including 7751, 7753, 7754, 7760, and 7765. It is specifically designed for use with the Incabloc shock-absorber system and annular balance .
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.
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