ETA / Valjoux 7750-8600 Hour Counting Wheel

Product Description

The ETA / Valjoux 7750-8600 Hour Counting Wheel is a genuine Swiss-made replacement part designed for the iconic ETA 7750 automatic chronograph movement (also known as Valjoux 7750). This component plays a critical role in the chronograph module, ensuring accurate hour recording during timing operations. It is a common service part replaced when the 12‑hour counter exhibits skipping, stuttering, or complete failure to advance.

Features & Function

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

• Chronograph module component – drives the 12‑hour recording function during timing operations

• Critical for elapsed time accuracy – ensures correct hour counter advancement

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

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

Specifications

• Part Number: 7750-8600

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

• Function: 12‑hour counter drive (chronograph hour recording)

• 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 hour counting wheels

• 12‑hour counter restoration – resolving skipping, stuttering, or non‑advancing issues

• Suitable for professional watchmakers and experienced repair technicians

FAQs

1. Is this a genuine ETA/Valjoux part?
Yes, this is a genuine ETA factory part (reference 7750-8600), made in Switzerland. It is not an aftermarket or generic copy.

2. Which movements is this hour counting wheel compatible with?
This hour counting 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 counting wheel?
The hour counting wheel drives the 12‑hour totalizer subdial at 6 o’clock, advancing to record elapsed hours during chronograph operation. It works in conjunction with the hour counting jumper (7750-8606) to ensure precise indexing.

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