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The ETA 2824/2834/2836-721 Balance Wheel is a genuine Swiss-made component for the ETA 2824-2, 2834-2, and 2836-2 automatic movements. As the heart of the mechanical timepiece, the balance wheel is an oscillating component that, together with the hairspring, forms a harmonic oscillator regulating the gear train’s pace . This pre-assembled, complete timed balance (Article 23) includes the balance wheel, hairspring, and stud, and is essential for watchmakers restoring proper amplitude and rate accuracy when the original balance becomes damaged or worn. The ETA 2824-2 is a 25.6 mm automatic caliber introduced in 1982, widely regarded as one of the most robust and reliable mechanical movements in production .
Genuine ETA part – authentic Swiss-made, pre-assembled balance complete with hairspring and stud
Regulating system component – controls the oscillation rate for accurate timekeeping
NIVAROX II balance – anti-magnetic and temperature-compensated material for stable performance
Direct replacement – drop-in replacement for worn or damaged balance assemblies
Precision-engineered – manufactured to ETA’s original specifications
Part Number: 2824/2834/2836-721 / 721
Article Number: 23
Compatible Movements: ETA 2824-2, 2834-2, 2836-2
Movement Diameter: 25.6 mm (11½”’)
Movement Height: 4.60 mm
Jewels: 25
Frequency: 28,800 vph (4 Hz)
Power Reserve: ~38–42 hours
Balance Type: NIVAROX II annular balance
Origin: Switzerland (ETA factory part)
Condition: Brand new
Service and overhaul of ETA 2824/2834/2836 family movements
Balance assembly replacement – replacing damaged, broken, or worn balance wheels
Timekeeping restoration – restoring correct amplitude and rate to the movement
Suitable for professional watchmakers and experienced repair technicians
1. Is this a genuine ETA part?
Yes, this is a genuine ETA factory part (reference 2824/2834/2836-721), made in Switzerland. It is the factory-assembled and timed balance complete for the ETA 2824 family movements .
2. Which movements is this balance wheel compatible with?
This balance wheel is compatible with ETA 2824-2, 2834-2, and 2836-2 movements, a 25.6 mm caliber family widely used in mid-range automatic watches from brands including Tudor, Breitling, and TAG Heuer.
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 . It works together with the hairspring to form a harmonic oscillator that regulates the gear train’s pace .
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