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Ceramic case Big Bang; ceramic cannot be polished and is brittle at edges; inspect lug tips for chips under loupe.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| case | Ceramic surface condition | Original ceramic surface texture intact; no polish marks; ceramic is harder than steel | Polished ceramic surfaces; ceramic cannot be conventionally polished |
| case | Lug and edge chip inspection | Lug tips and case edges chip-free under loupe inspection | Chips on lug tips or case edges; ceramic brittleness under lateral impact |
| caseback | UNICO movement architecture | Cal. HUB1242 UNICO column-wheel flyback architecture visible through caseback | ETA 7750 or other movement; counterfeit or movement swap |
