Spotting Fake Patek Philippe Nautilus

Key Points from the Discussion

• The accuracy of fake perpetual calendars is surprising, given the short time the genuine model has been on the market, with concerns that counterfeiters will improve further.
• A key tell on some fake Nautiluses is the presence of a fliplock clasp on the last link, contrasting with the genuine twin-trigger deployant clasp.
• On a fake 5711, the date window is incorrectly positioned inside the minute markers, a detail difficult to spot from images alone.
• The fake 5740 is identified as having multiple errors, including two 24-hour indicators, a leap year indicator without a month, and a moon-phase aperture with a day-and-night wheel.
• Specific flaws on the moon phase indicator of a fake include incorrect stripes, a sun instead of a moon, and too many, too small stars.
• The lack of a month indicator on the fake 5740 and an undifferentiated date color are noted as clear discrepancies.