ETA 7750-410 Winding Pinion

Product Description

The ETA 7750-410 Winding Pinion is a genuine Swiss-made replacement component for the ETA/Valjoux 7750 automatic chronograph movement. As part of the keyless works mechanism, this winding pinion transfers manual winding motion from the crown to the mainspring, enabling the movement to be wound for its 42–48 hour power reserve. It is a critical part to replace when a winding pinion shows wear, broken teeth, or difficulty engaging during manual winding.

Features & Function

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

• Keyless works component – transmits manual winding power from the crown to the mainspring

• Essential for winding function – enables manual winding to maintain the 42–48 hour power reserve

• Direct replacement – drop-in replacement for worn or damaged winding pinions

• Precision-engineered – manufactured to ETA’s original specifications for correct fit and function

Specifications

• Part Number: 7750-410 / ETA7750.410

• Compatible Movement: ETA/Valjoux 7750

• Movement Diameter: 30.0 mm

• Movement Height: 7.9 mm

• Jewels: 25

• Frequency: 28,800 vph (4 Hz)

• Power Reserve: 42–48 hours

• Origin: Switzerland (ETA factory part)

• Condition: Brand new

Applications

• Service and overhaul of ETA/Valjoux 7750 movements

• Keyless works repair – replacing worn or damaged winding pinions

• Winding function restoration – enabling smooth manual winding operation

• 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 7750-410), made in Switzerland. It is not an aftermarket or generic component.

2. Which movement is this winding pinion compatible with?
This winding pinion is specifically designed for the ETA/Valjoux 7750 automatic chronograph movement.

3. What are the signs that the winding pinion needs replacement?
Common signs include difficulty turning the crown, rough winding feel, clicking sounds during winding, or visible wear/damage to the teeth during inspection.

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