ETA 7750-8335 Operating Lever Spring

Product Description

The ETA 7750-8335 Operating Lever Spring is a genuine Swiss-made component for the ETA/Valjoux 7750 automatic chronograph movement. This spring provides tension to the operating lever, ensuring proper engagement of the chronograph functions. A common service item, it is typically replaced when chronograph start/stop or reset functions become irregular or unresponsive.

Features & Function

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

• Chronograph mechanism component – provides tension to the operating lever for proper chronograph function

• Critical for chronograph operation – enables smooth engagement of start, stop, and reset functions

• Direct replacement – drop-in replacement for worn or broken springs

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

Specifications

• Part Number: 7750-8335

• Compatible Movements: ETA/Valjoux 7750, 7751, 7753, 7754, 7756, 7760, 7765

• Function: Operating lever spring (2 functions)

• Movement Diameter: 30.0 mm

• Movement 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

• Chronograph mechanism repair – replacing worn or broken operating lever springs

• Chronograph function restoration – resolving start/stop or reset issues

• 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 7750-8335), made in Switzerland. It is not an aftermarket or generic copy.

2. Which movements is this operating lever spring compatible with?
This spring is compatible with the ETA/Valjoux 7750 and its variants, including 7751, 7753, 7754, 7756, 7760, and 7765.

3. What are the signs that the operating lever spring needs replacement?
Common signs include chronograph not starting/stopping smoothly, irregular resetting behavior, sticky chronograph operation, or visible breakage during inspection.

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