ETA 7750-8350 Hammer Spring

Product Description

Genuine ETA 7750-8350 Hammer Spring, Made in Switzerland, brand new — the original factory spring component for the ETA/Valjoux 7750 chronograph movement’s reset mechanism. Precisely engineered to store and release precise spring force that drives the chronograph reset hammer, the Hammer Spring delivers the instantaneous impact energy required to snap the chronograph counters back to zero upon reset activation. An essential replacement part for restoring a fatigued or broken hammer spring during movement service. Original ETA part — the professional’s choice for genuine chronograph reset energy restoration.

Features & Function

• Genuine ETA 7750-8350 — original Swiss-made factory part, brand new, authentic, part number 7750-8350
• Hammer spring — stores and releases precise spring force to drive the chronograph reset hammer upon reset activation
• Instantaneous impact energy — engineered to deliver immediate, powerful reset force for reliable snap-to-zero operation
• Coordinated reset system — works in sequence with operating levers to ensure synchronized reset of all chronograph counters
• Original factory quality — exact spring tension and dimensional specifications for perfect fit in the ETA/Valjoux 7750 movement

Specifications

Applications

• Replacement of fatigued, broken, or weakened Hammer Spring in the ETA/Valjoux 7750 movement
• Repair of chronograph reset failures: chronograph counters not resetting, weak or slow reset snap
• Repair of spring-related issues: loss of impact force, inconsistent reset timing, or hammer failing to return
• 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 7750-8350 Hammer Spring, 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 7750-8350 is the specific Hammer Spring 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 Hammer Spring do?
A: The Hammer Spring (7750-8350) is the energy source of the chronograph reset mechanism. When you press the reset pusher, the reset sequence is: Reset pusher → Hammer Spring (7750-8350) releases stored energy → Drives Chronograph Hammer (7750-8220) → Hammer strikes recording pieces → All chronograph counters snap to zero. The Hammer Spring is what stores the mechanical energy and releases it instantly to drive the hammer. Without a functioning hammer spring, the chronograph will not reset — the hammer has no driving force.

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