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The ETA 2671-721 Movement Balance Wheel is a genuine Swiss-made component for the ETA 2671 automatic movement family, with part number 2671-721, Article 23. 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, timed balance unit is essential for watchmakers restoring proper amplitude and rate accuracy when the original balance becomes damaged or worn. The ETA 2671 is a 17.2mm automatic caliber widely used in ladies’ watches from brands including Tissot, Mido, Longines, and Tudor .
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
Incabloc shock protection compatible – protects the delicate balance staff pivots from impact
Direct replacement – drop-in replacement for worn or damaged balance assemblies
Part Number: 2671-721 / 721
Article Number: 23
Compatible Movement: ETA 2671
Movement Diameter: 17.2 mm (7¾”’)
Movement Height: 4.80 mm
Jewels: 25 (for this version)
Frequency: 28,800 vph (4 Hz)
Power Reserve: ~38 hours
Balance Type: NIVAROX II anular balance
Shock Protection: Incabloc
Origin: Switzerland (ETA factory part)
Condition: Brand new
Service and overhaul of ETA 2671 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 2671-721), made in Switzerland. It is the factory-assembled and timed balance complete for the ETA 2671 movement family.
2. Which movements is this balance wheel compatible with?
This balance wheel is specifically designed for the ETA 2671 movement, a 17.2 mm automatic caliber widely used in ladies’ watches . The 2671 is based on the Zenith 48.5AF and has been in production since 1971 .
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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