ETA 7750-1142 Movement Automatic Device Bridge

Product Description

The ETA 7750-1142 Movement Automatic Device Bridge is a genuine Swiss-made component for the ETA/Valjoux 7750 automatic chronograph movement. This jewelled bridge is part of the automatic winding mechanism and supports the oscillating weight (rotor) and winding components, ensuring stable operation of the self-winding system . As an “upper bridge for automatic device” , it is a key structural component that must be replaced if damaged to restore proper automatic winding function.

Features & Function

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

• Automatic winding mechanism component – supports the oscillating weight and winding elements 

• Jewelled construction – fitted with jewels to reduce friction and wear 

• Upper bridge design – works with the lower bridge (1141) to form the complete automatic device bridge set 

• Direct replacement – drop-in replacement for damaged or worn automatic device bridges

Specifications

• Part Number: 7750-1142 / 1142

• Article Number: 44 

• Compatible Movements: ETA/Valjoux 7750, 7751, 7753, 7754, 7760, 7765, 7770 

• Part Type: Upper bridge for automatic device (jewelled) 

• ETA Reference: 104571 

• Nickel-plated finish: Yes 

• Caliber Diameter: 30.0 mm 

• Caliber Height: 7.9 mm 

• Jewels: 25 (movement total) 

• Frequency: 28,800 vph (4 Hz) 

• Lift Angle: 49° 

• Power Reserve: ~48 hours 

• Origin: Switzerland (ETA factory part) 

• Condition: Brand new

Applications

• Service and overhaul of ETA 7750-series movements

• Automatic winding system repair – replacing damaged or worn device bridges

• Rotor assembly restoration – ensuring stable support for the oscillating weight

• 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 7750-1142), made in Switzerland. It is not an aftermarket or generic copy .

2. Which movements is this automatic device bridge compatible with?

This bridge is compatible with the ETA/Valjoux 7750 and its variants, including 7751, 7753, 7754, 7760, 7765, and 7770 .

3. What is the difference between the upper bridge (1142) and lower bridge (1141)?

The upper bridge (1142) and lower bridge (1141) work together to form the complete automatic device bridge assembly . The 1142 is the upper part that supports the rotor, while the 1141 is the lower bridge that completes the automatic winding module.

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