ETA 7750-1497 Movement Ball Bearing

Product Description

The ETA 7750-1497 Movement Ball Bearing is a genuine Swiss-made component for the ETA/Valjoux 7750 automatic chronograph movement. This ball bearing assembly supports the automatic winding rotor, enabling smooth, low-friction rotation for efficient self-winding. The 7750 movement is equipped with a ball bearing-mounted rotor system featuring 5 balls, which contributes to the caliber’s renowned reliability and durability .

Features & Function

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

• Automatic rotor bearing – supports the rotor for smooth bi-directional or unidirectional rotation

• Ball bearing system – 5-ball design minimizes friction and wear

• Critical for winding efficiency – ensures reliable self-winding performance

• Direct replacement – drop-in replacement for worn or noisy rotor bearings

Specifications

• Part Number: 7750-1497

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

• Function: Automatic rotor ball bearing assembly

• Rotor Type: Ball bearing system (typically 5 balls, 1 screw) 

• Winding Direction: Uni-directional (clockwise) 

• Caliber Diameter: 30.0 mm 

• Caliber Height: 7.9 mm 

• Jewels: 25 

• Frequency: 28,800 vph (4 Hz) 

• Power Reserve: ~46–48 hours 

• Origin: Switzerland (ETA factory part)

• Condition: Brand new

Applications

• Service and overhaul of ETA 7750-series movements

• Automatic winding repair – replacing worn, noisy, or seized rotor bearings

• Rotor restoration – ensuring smooth and efficient self-winding

• 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 7750-1497), made in Switzerland. It is not an aftermarket or generic copy.

2. Which movements is this ball bearing compatible with?

This ball bearing is compatible with the ETA/Valjoux 7750 and its variants, including 7751, 7753, 7754, 7760, and 7765. The 7750’s ball-bearing mounted rotor is one of its defining features .

3. What are the signs that the ball bearing needs replacement?

Common signs include grinding or rattling noise from the rotor, reduced winding efficiency, rough rotor rotation, or visible wear/damage during inspection. A qualified watchmaker can diagnose these issues .

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