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This execution of Cal. 01 has only two registers (running seconds and a 30-minute counter); a caseback or dial showing a 12-hour counter belongs to a different Superocean Heritage chronograph.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Two-register chronograph layout | Running-seconds subdial and a single 30-minute counter only, with a date aperture at 6 o'clock; no 12-hour counter present | A third (12-hour) chronograph subdial present, which does not match this reference's movement configuration |
| caseback | Cal. 01 column-wheel architecture | Column wheel and vertical clutch visible through the sapphire exhibition caseback, signed with the Breitling Manufacture caliber designation | Cam-actuated chronograph layout with no column wheel, indicating a movement swap |
| case | Ceramic bezel insert fit | Dial-matched ceramic bezel insert set into the unidirectional ratcheted bezel, with firm, even click action through its full range | Loose or uneven bezel action, or an insert color mismatched to the dial |