ETA 7750-721 Movement Balance Wheel

Product Description

The ETA 7750-721 Movement Balance Wheel is a genuine Swiss-made component for the ETA/Valjoux 7750 automatic chronograph movement. As a core part of the regulating system, the balance wheel controls the oscillation rate of the movement, ensuring accurate timekeeping and stable performance . This brand new original part is essential for watchmakers restoring proper amplitude and precision timing when the original balance wheel becomes worn or damaged .

Features & Function

• Genuine ETA/Valjoux part – authentic Swiss-made component for the ETA 7750 movement 

• Regulating system component – controls the oscillation rate for accurate timekeeping 

• Complete balance assembly – includes balance wheel, hairspring, and stud 

• Direct replacement – drop-in replacement for worn or damaged balance assemblies 

• Precision-engineered – manufactured to ETA’s original specifications 

Specifications

• Part Number: 7750-721 / 721 

• Compatible Movements: ETA/Valjoux 7750, 7751, 7753, 7754, 7760, 7765 

• Part Type: Timed balance, regulated, with stud, standardized 

• Movement Diameter: 30.0 mm (13¼”’) 

• Movement Height: 7.9 mm 

• Jewels: 25 

• Frequency: 28,800 vph (4 Hz) 

• Lift Angle: 49° 

• Power Reserve: ~48 hours 

• Anti-Shock System: Incabloc 

• Origin: Switzerland (ETA factory part) 

• Condition: Brand new

Applications

• Service and overhaul of ETA 7750-series movements 

• Balance assembly replacement – replacing damaged, broken, or worn balance wheels and hairsprings 

• Timekeeping restoration – restoring correct amplitude and rate to the movement 

• Suitable for professional watchmakers and experienced repair technicians

FAQs

1. Is this a genuine ETA part?

Yes, this is a genuine ETA factory part (reference 7750-721), made in Switzerland. It is not an aftermarket or generic copy .

2. Which movements is this balance wheel compatible with?

This balance wheel is compatible with the ETA/Valjoux 7750 and its variants, including 7751, 7753, 7754, 7760, 7761, and 7765 .

3. What is the function of the balance wheel?

The balance wheel is part of the regulating system that controls the oscillation rate of the movement, ensuring accurate timekeeping and stable performance .

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