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This is a genuine Sellita SW500-705 escape wheel, a Swiss‑made original component designed for the Sellita SW500 automatic chronograph movement. As the core element of the escapement, it works with the pallet fork and balance wheel to convert gear train energy into precise oscillating beats, controlling timekeeping accuracy. This brand new original part is the ideal replacement for watchmakers to restore stable timekeeping when servicing the SW500 movement.
Genuine Sellita Part – Swiss factory‑original for SW500, not a copy.
Escapement Core – Works with the pallet fork and balance to convert gear train energy into stable oscillation.
Precision Machined – Accurate tooth geometry for efficient power transfer and low friction.
Essential for Service – Common failure point for inaccurate timekeeping, stoppage, or low amplitude.
Compatible Movement – Designed for Sellita SW500 automatic chronograph.
| Parameter | Details |
|---|---|
| Part Name | Escape Wheel |
| Part Number | Sellita SW500-705 |
| Compatible Movement | Sellita SW500 automatic chronograph |
| Function | Escapement power transmission, controls timekeeping accuracy |
| Origin | Switzerland |
| Condition | Brand new, genuine |
Sellita SW500 automatic chronograph movement (found in various chronograph watches using SW500 as an alternative to ETA 7750).
Repair of severe timekeeping errors, stoppage, or low amplitude not resolved by routine service.
Replacement of escape wheels with worn teeth, bent pivots, or damaged jewel holes during service.
1. Is this a genuine Sellita escape wheel?
Yes. It is a Swiss factory‑original part (SW500-705) for the SW500 movement, not a copy.
2. Does this escape wheel fit the ETA 7750 movement?
SW500 is an alternative to ETA 7750. The escape wheel dimensions are generally the same and often interchangeable. However, using dedicated parts for each caliber is recommended for best fit. This genuine Sellita part will likely work in a 7750, but compatibility is not guaranteed across all variants.
3. What are the symptoms of a damaged escape wheel?
Symptoms: very fast or slow timekeeping; stoppage or intermittent running; very low amplitude; irregular ticking noise from the escapement.
4. What should I pay attention to during installation?
The escape wheel sits between the mainplate and the escape bridge. Ensure both pivots drop into jewels and the teeth properly engage the pallet fork. Follow the Sellita technical guide. Professional installation is strongly recommended.
5. Is regulation required after replacement?
Yes. After replacing the escape wheel, check amplitude, beat error, and rate, and adjust as needed. Use a timing machine for final verification.
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