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A discontinued platinum perpetual calendar is bought on condition and completeness rather than on the risk of a fake, and the outsize date is the part that most rewards a close look.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Outsize date alignment | Both date discs sit level with each other and centred in the frame, changing together and instantaneously | Discs at different heights, a numeral clipped by the frame, or a date that crawls over several minutes |
| case | Case edge definition in platinum | Crisp transitions between polished and brushed surfaces, with lug edges still sharp | Softened or wavering edges and a uniformly bright case, both signs of repeated polishing |
| movement | Caliber L922.1 Sax-0-Mat and ZERO-RESET | Pulling the crown resets the seconds to zero instantly; the movement is finished with Glashütte ribbing and a hand-engraved balance cock | Seconds that free-run with the crown out, or an engraved balance cock whose cut looks stamped and uniform |
| dial | Calendar and moon phase coherence | Day, date, month, leap-year and moon phase all agree with each other and with the real date | Indications that cannot be reconciled by setting, which points to a calendar mechanism out of phase |
Pre-purchase sheet → The numbers to check, what to look at and what to ask, on one printable page.
