ETA 7750-255 Hour Wheel

Product Description

The ETA 7750-255 Hour Wheel is a genuine Swiss-made component for the ETA/Valjoux 7750 automatic chronograph movement. The hour wheel is responsible for driving the 12-hour totalizer subdial at the 6 o’clock position, a critical part of the chronograph’s elapsed time recording function. This brand new original part is essential for watchmakers restoring proper chronograph hour counter function when the original wheel becomes worn or damaged.

Features & Function

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

• 12-hour counter component – drives the elapsed hours subdial (6 o’clock position)

• Critical for chronograph function – ensures accurate recording of elapsed hours

• Direct replacement – drop-in replacement for worn or damaged hour wheels

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

Specifications

• Part Number: 7750-255

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

• Subdial Position: 6 o’clock (12-hour totalizer)

• 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 7750-series movements

• Chronograph mechanism repair – replacing worn or damaged 12-hour counter wheels

• Chronograph function restoration – ensuring accurate elapsed hour recording

• 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 7750-255), made in Switzerland. It is not an aftermarket or generic copy.

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

3. What is the function of the hour wheel in the 7750 chronograph?
The hour wheel drives the 12-hour totalizer subdial at 6 o’clock, recording elapsed hours when the chronograph is running. It is a critical component for the chronograph’s elapsed time recording function.

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