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Authentication
Ceramic bezel is the primary authentication focus; any chip requires full insert replacement, not repair.
- Ceramic bezel chips are irreparable; only full insert replacement through authorized service is correct.
- Cal. 5 Sellita SW200 base is correct for this reference; do not confuse with higher-grade calibers.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| case | Ceramic bezel condition | Unitary ceramic bezel insert with no chips, cracks, or repairs; surface uniform | Any chip in the ceramic; repair compound filling chip; bezel insert showing cracks |
| caseback | Caliber 5 identity | TAG Cal. 5 designation; Sellita SW200-based architecture; 300m water resistance gasket intact | Incorrect caliber designation; caseback gasket showing degradation or damage |
| crown | Screw-down crown | Crown screws down flush with crown tube; 300m rating depends on correct crown engagement | Crown does not screw down; cross-threading on crown tube; crown tube damage |
- Original Aquaracer steel bracelet; rubber strap is an authorized factory option.
Authentication guide
The 2021 Aquaracer Professional 300 is a significant generational redesign: the new case is more angular, the bezel is now unidirectional with a ceramic insert, and the case profile is thinner than the prior generation. At 300m water resistance it competes directly with the Omega Seamaster Diver 300M. The ceramic bezel insert and case geometry are the primary authentication checks.






