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Authentication
Verify all screwed-in crown and pushers thread fully; stripped threads compromise the water-resistance design.
- The screwed-in pushers and crown are the water-resistance mechanism; any that will not thread down fully indicate damage.
- Cal. 13 is Valjoux 7750-based; the caseback will show the characteristic 7750 rotor which is correct.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| crown | Screw-down crown thread integrity | Crown unscrew and rescrews fully with clean threads; no cross-threading or stripping | Crown that slips or does not thread down fully; indicates stripped threads requiring case service |
| case | Screw-in pusher integrity | Both pushers thread in and out cleanly; function correctly when depressed after unscrewing | Pushers that will not thread in fully or are stuck in the unscrewed position; water resistance is not assured |
| caseback | Cal. 13 Valjoux 7750 architecture | Valjoux 7750 rotor and layout through exhibition caseback; Breitling signed and finished appropriately | Movement architecture inconsistent with the 7750 family; unsigned movement |
- Screw-in crown and pusher gaskets require periodic replacement; factor into service cost.
- Cal. 13 service is widely available given the Valjoux 7750 base caliber.
Authentication guide
The Avenger Chronograph 43 runs the Cal. 13, which is an ETA Valjoux 7750-derived movement finished and COSC-certified by Breitling. The Avenger is the largest and most robust Breitling chronograph case, with a pronounced crown at 9 o'clock and large screw-down pushers. The 7750-based movement is well-documented and easy to verify through the caseback.





