Short answer
Patek Philippe built the Nautilus 5711 in small numbered batches and discontinued the steel version in 2021. A listing that promises a limited edition copy is describing a watch that was already scarce. Inspect the case, dial, bracelet, and movement in that order. One mismatch is enough to end the deal.
What you need
- A caliper or a ruler marked in millimeters
- A 10x jeweler's loupe
- The reference number from the seller's listing
- A phone camera for close-up photos
Step-by-step checks
- Measure the case. A genuine 5711/1A is 40 mm across and about 8.3 mm thick. Copies run 10 mm to 12 mm thick because the movements inside sit taller than the Patek caliber.
- Turn the watch into a raking light and study the dial. The blue and olive dials carry horizontal embossed grooves that run edge to edge. Copies print the pattern or cut it shallow, and the lines stop short of the chapter ring.
- Check the printing with the loupe. Genuine dials show sharp, even letter spacing with no ink bleed. The applied hour markers sit in white gold frames with clean bevels.
- Open the date window. On the real 5711 the date sits in a framed aperture with a crisp edge, and the font is thin and upright. Copies use a thicker font and often misalign the disc.
- Sight down the bracelet from the clasp. Genuine links taper by roughly one third between the case and the clasp, and every flank is polished while the top surfaces stay brushed. Copies show rounded edges and uneven brushing.
- Snap the clasp shut and press the crown. The genuine clasp closes with one firm click, and the screw-down crown turns without grit and carries a stamped Calatrava cross.
- Look through the sapphire case back. Reference 5711/1A-010 and later steel models use Caliber 26-330 S C with a 21K gold rotor and Cotes de Geneve stripes. Copies hide a Miyota or Seagull movement, and the engraving is stamped rather than cut.
- Ask for the serial and reference number, then have an authorized Patek Philippe dealer or the brand's archive service confirm both. A genuine limited piece always has a paper trail.
- Walk away from Tiffany and Co. dial claims. That 5711/1A-018 run was capped at 170 watches in 2021 and every piece is documented, so any limited edition copy sold online is a counterfeit by definition.
Why limited-edition labels show up on fakes
Sellers attach the phrase to ordinary copies to justify a higher price and to explain why the watch is hard to source. The 5711/1P 40th anniversary run was 700 pieces, and the Tiffany version was 170. Both figures are published, and both are recorded with the factory. A seller who cannot produce a matching certificate, box, and service history is offering a replica, whatever the listing says.
If you already bought one
Stop wearing it and stop any payment still in progress. Report the sale to the platform and to your card issuer, and keep screenshots of the listing. Counterfeit watches can also be seized by customs, so a refund request is faster and cleaner than a resale attempt.