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This is a genuine ETA 7750-407 sliding pinion (Article number 3), an original Swiss-made component for the ETA/Valjoux 7750 automatic chronograph movement.
The sliding pinion is a key part of the chronograph engagement mechanism, sliding along the winding stem to connect the chronograph wheel train when the pusher is activated.
This brand new replacement part is essential for watchmakers restoring proper chronograph start, stop, and reset functions.
Genuine ETA Part – Swiss factory-original for Caliber 7750, not a copy.
Chronograph Engagement Core – Slides along the winding stem to engage the chronograph train when the pusher is activated.
Precision Machined – Accurate gear teeth and sliding surfaces for smooth, durable engagement.
Essential for Service – Common failure point when chronograph start/stop/reset malfunctions.
Compatible Movement – Designed for ETA 7750 (Valjoux 7750) automatic chronograph.
| Parameter | Details |
|---|---|
| Part Name | Sliding Pinion |
| Part Number | ETA 7750-407 (Article 3) |
| Compatible Movement | ETA/Valjoux 7750 automatic chronograph |
| Function | Engages the chronograph train when activated |
| Origin | Switzerland |
| Condition | Brand new, genuine |
ETA 7750 (Valjoux 7750) automatic chronograph (common in Breitling, Omega, IWC, Tissot, etc.)
Repair of chronograph faults: start, stop, or reset functions not working
Replacement of worn, broken, or sticky sliding pinions during movement service
1. Is this a genuine ETA part?
Yes. It is a Swiss ETA factory-original part (7750-407) for the 7750 movement.
2. What are the symptoms of a damaged sliding pinion?
Symptoms: chronograph does not start when the pusher is pressed; cannot stop after start; reset does not work; intermittent chronograph failure.
3. What should I pay attention to during installation?
The sliding pinion sits on the winding stem and engages the chronograph coupling wheel. Clean keyless and chronograph parts before assembly. Follow the ETA technical guide. Professional installation is strongly recommended.
4. Does this part fit the Sellita SW500?
SW500 is an alternative to 7750. Chronograph engagement parts are often interchangeable, but using dedicated SW500 parts is recommended for best fit.
5. Does the chronograph coupling wheel need to be replaced at the same time?
Not always. If the coupling wheel teeth are also visibly worn, replace both. Inspect both components.
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