ETA 7750-8670 Set Hour Hammer Operating Lever

Product Description

Genuine ETA 7750-8670 Set Hour Hammer Operating Lever, Made in Switzerland, brand new — the original factory operating lever component for the ETA/Valjoux 7750 chronograph movement’s reset mechanism. Precisely engineered to actuate the hour recording hammer during chronograph reset, the Set Hour Hammer Operating Lever transfers the reset pusher force to precisely coordinate the recording of hour and minute counters. An essential replacement part for restoring faulty or worn operating lever during movement service. Original ETA part — the professional’s choice for genuine chronograph reset mechanism restoration.

Features & Function

• Genuine ETA 7750-8670 — original Swiss-made factory part, brand new, authentic, part number 7750-8670
• Hour hammer operating lever — actuates the hour recording hammer to reset the hour counter during chronograph reset
• Reset force transmission — transfers the reset pusher force to coordinate hour and minute counter recording
• Precision timing coordination — ensures synchronized reset of chronograph counters in correct sequence
• Original factory quality — exact dimensional specifications for perfect fit in the ETA/Valjoux 7750 movement

Specifications

Applications

• Replacement of worn, damaged, or bent Set Hour Hammer Operating Lever in ETA/Valjoux 7750 movements
• Repair of chronograph counter reset failures: hour counter not resetting, partial reset, or reset sequence misalignment
• Repair of operating lever mechanism: lever disengagement or failure to actuate hour recording hammer
• 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 7750-8670 Set Hour Hammer Operating Lever, 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 with hour and minute recording counters. The part number 7750-8670 is the specific Set Hour Hammer Operating Lever for 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 Set Hour Hammer Operating Lever do?
A: The Set Hour Hammer Operating Lever is a precision lever in the chronograph reset mechanism. When the reset pusher is pressed, the reset force travels through the operating levers to the recording hammers (60S hammer for seconds, Hour hammer for hours). The Set Hour Hammer Operating Lever specifically actuates the hour recording hammer, ensuring the hour counter resets correctly in coordination with the minute and seconds counters. It is part of the precise sequential reset system — if it fails, the hour counter will not reset during the reset cycle.

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