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A reversible case with a calendar on one face and a second time zone on the other means two dials, one movement and a swivel cradle, and most of what can go wrong with a used one is mechanical rather than counterfeit.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| case | Swivel action and lock-up in the cradle | The case turns with even resistance and seats positively in both orientations with no lateral play | Gritty or uneven rotation, audible rattle, or a case that will not sit flat once flipped |
| dial | Calendar alignment on the recto | Day, date and month apertures fully framed with no partial characters when the calendar is settled | An indication sitting between two positions outside the changeover window, which suggests a slipped calendar wheel |
| movement | Caliber 853 running and reserve | Manual wind reaching a firm stop, and a 42-hour reserve from full wind | A mainspring that slips continuously with no stop, or a watch that stops well short of 42 hours |
| caseback | Verso dial and day/night indication | Second time zone and day/night disc move together and agree with the recto when set to the same zone | A day/night disc that does not track the verso hands |
Pre-purchase sheet → The numbers to check, what to look at and what to ask, on one printable page.
