ETA 7750-8690 Hour Counter Lock

Product Description

Genuine ETA 7750-8690 Hour Counter Lock, Made in Switzerland, brand new — the original factory locking component for the ETA/Valjoux 7750 chronograph movement’s 12-hour counter mechanism. Precisely engineered to physically lock the hour counter in precise positions during chronograph operation and reset, the Hour Counter Lock ensures reliable 12-hour counter advancement and prevents counter drift during chronograph timing. An essential replacement part for restoring a worn or damaged hour counter lock during movement service. Original ETA part — the professional’s choice for genuine chronograph counter mechanism restoration.

Features & Function

• Genuine ETA 7750-8690 — original Swiss-made factory part, brand new, authentic, part number 7750-8690
• Hour counter lock — physically locks the 12-hour counter in precise positions during chronograph operation
• Counter advancement support — ensures reliable 12-hour counter progression each time the minute counter completes its cycle
• Drift prevention — prevents unwanted counter movement or drift during chronograph timing and reset sequences
• Original factory quality — exact locking geometry and dimensional specifications for perfect fit in the ETA/Valjoux 7750 movement

Specifications

Applications

• Replacement of worn, damaged, or stripped Hour Counter Lock in the ETA/Valjoux 7750 movement
• Repair of 12-hour counter failures: counter not locking properly, counter advancing incorrectly, or counter drift
• Repair of chronograph counter mechanism: hour counter locking failure or reset sequence malfunction
• Professional movement service, overhaul, and chronograph restoration
• Certified watchmaker and service center parts supply

FAQ

Q1: Is this a genuine ETA part?
A: Yes — this is a genuine ETA 7750-8690 Hour Counter Lock, Made in Switzerland, brand new. It is an original factory part from ETA (Swatch Group), the world’s leading movement manufacturer. Not a generic or replica part.

Q2: How do I confirm this part fits my movement?
A: Confirm your movement is an ETA/Valjoux 7750 chronograph. The part number 7750-8690 is the specific Hour Counter Lock for the 12-hour counter mechanism in this movement. Common brand applications include: IWC Portugieser Chronograph, Omega Speedmaster (older 7750 variant), Tag Heuer Monaco, Breitling Navitimer, and many other chronographs using the Valjoux/ETA 7750 platform.

Q3: What does the Hour Counter Lock do?
A: The Hour Counter Lock (7750-8690) is the locking mechanism for the chronograph’s 12-hour counter. The 7750 chronograph has three registers: the central seconds hand, the 30-minute counter at 12 o’clock, and the 12-hour counter (typically at 6 o’clock). The 12-hour counter advances one position every 30 minutes of chronograph running. The Hour Counter Lock ensures that the 12-hour counter gear is locked in precise positions during chronograph operation — without locking, the counter could drift or advance incorrectly. During the chronograph reset sequence, the lock also coordinates with the reset hammers to release the counter for correct return to zero.

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