ETA 7750-9433 Stop Lever

Product Description

Genuine ETA 7750-9433 Stop Lever, Made in Switzerland, brand new — the original factory balance-stopping lever for the ETA/Valjoux 7750 chronograph movement’s hacking seconds mechanism. Precisely engineered to engage with the balance wheel and halt its oscillation when the crown is pulled out to the time-setting position, the Stop Lever enables precise time synchronization and prevents mainspring overwinding during setting. An essential replacement part for restoring a worn or damaged stop lever during movement service. Original ETA part — the professional’s choice for genuine hacking mechanism restoration.

Features & Function

• Genuine ETA 7750-9433 — original Swiss-made factory part, brand new, authentic, part number 7750-9433
• Stop lever — balance-stopping lever that halts the balance wheel when crown is pulled out to the time-setting position
• Precise time synchronization — allows the watch to be synchronized with an official time signal by stopping and restarting at exact seconds
• Overwinding protection — prevents mainspring from continuing to wind during time-setting to protect the mainspring
• Original factory quality — exact lever geometry and engagement specifications for perfect fit in the ETA/Valjoux 7750 movement

Specifications

Applications

• Replacement of worn, fatigued, or damaged Stop Lever in the ETA/Valjoux 7750 movement
• Repair of hacking mechanism failures: balance wheel not stopping when crown is pulled out
• Repair of time-setting synchronization issues: seconds not stopping for precise synchronization
• Repair of overwinding protection failures: mainspring continuing to wind during time-setting
• Professional movement service, overhaul, and chronograph restoration

FAQ

Q1: Is this a genuine ETA part?
A: Yes — this is a genuine ETA 7750-9433 Stop 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. The part number 7750-9433 is the specific Stop 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 Stop Lever do?
A: The Stop Lever (7750-9433) is the balance-stopping component of the hacking seconds mechanism. When the crown is pulled out to the time-setting position (Position 2), the setting lever moves and engages the stop lever, which in turn physically contacts the balance wheel and halts its oscillation. This serves two purposes: (1) Precise time synchronization — by stopping the balance, the seconds hand stops at zero, allowing you to synchronize the watch exactly with an official time signal (e.g., a radio time signal). This is especially important for military and pilot watches. (2) Overwinding protection — by stopping the balance, the entire gear train stops, preventing the mainspring from continuing to wind while the crown is being used for time-setting. Without a functioning stop lever, the balance keeps running when the crown is pulled, making precise synchronization impossible and risking mainspring overwinding.

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