ETA 2000-721 Movement Balance Wheel For Longines L595/592

Product Description

The ETA 2000-721 Movement Balance Wheel is a genuine Swiss-made component for the ETA 2000 automatic movement family, also specified for use in Longines Caliber L595 and L592 movements. As a complete, pre-regulated balance assembly, this unit (Article 20) includes the balance wheel, hairspring, and stud, and is factory-timed to ETA’s original specifications. This brand new original part is essential for watchmakers restoring stable amplitude and precision timing when the original balance assembly becomes worn or damaged.

Features & Function

• Genuine ETA/Longines part – authentic Swiss-made component for ETA 2000 calibers and Longines L595/L592 movements

• Complete balance assembly – includes balance wheel, hairspring, and stud, ready for installation

• Factory-regulated – pre-timed to original specifications for correct amplitude and rate

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

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

Specifications

• Part Number: 2000-721 / 721

• Article Number: 20

• Compatible Movements: ETA 2000, ETA 2000-1, Longines L595, Longines L592

• Movement Diameter: 19.4 mm (8¾”’)

• Movement Height: 3.6 mm

• Jewels: 20

• Frequency: 28,800 vph (4 Hz)

• Power Reserve: ~40 hours

• Shock Protection: Incabloc

• Condition: New Old Stock (NOS), factory sealed

• Origin: Switzerland (ETA factory part)

Applications

• Service and overhaul of ETA 2000/2000-1 and Longines L595/L592 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 2000-721), made in Switzerland. It is supplied as factory-sealed New Old Stock (NOS).

2. Which movements is this balance wheel compatible with?

This balance wheel is specifically designed for the ETA 2000 and ETA 2000-1 calibers. It is also specified for use in Longines Caliber L595 and L592 movements, which are based on the ETA 2000-1 platform. The 2000-1 is an improved version introduced in 1997, featuring optimized wheel train teeth counts and rotor design.

3. What is the difference between L595 and L592?

L592 is the upgraded version of L595. Key improvements include upgrading the winding system from unidirectional to bidirectional and adopting a new shock protection system. Both are based on the ETA 2000-1 and share the same balance wheel reference (2000-721).

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