Short answer
A replica Patek Philippe Nautilus 5711/1A is a counterfeit watch. It copies the outside of a 40 mm steel Patek that Patek stopped making in 2021. No replica carries a Patek movement, a Patek warranty, or a Patek service record. Selling one in the US is a federal crime. Importing one risks seizure by US Customs and Border Protection.
What the genuine 5711/1A is
- Reference 5711/1A-010: steel case and bracelet, 40 mm across, 8.3 mm thick.
- Caliber 26-330 S C, automatic, 28,800 vph, 45 hour power reserve, 30 jewels.
- Water resistance rated to 120 m. Sapphire crystal front and back.
- Blue horizontal embossed dial on the -010. Green dial on the -014, the 2021 final run.
- Patek discontinued the 5711 in 2021. The 5811/1G replaced it: 41 mm, white gold.
Where replicas differ
Case thickness is the first tell. Genuine is 8.3 mm. Most replicas run 9.5 mm to 11 mm. That moves the caseback off the wrist and changes the bracelet end link angle.
Dial: the grooves on a genuine dial are cut. Replica dials show shallow lines, uneven spacing at the date window, and a date font that sits high or low against the frame.
Movement: most replicas use a Miyota 9015, a Seiko NH35, or a Chinese clone under a decorative bridge. None has the 26-330 layout. Rotor engraving depth and perlage differ under a loupe. Timegrapher spread on a $400 replica runs 15 to 25 seconds per day.
Bracelet: genuine center links have a bevel that draws a line of light. Replica brushing is coarser. Screw heads on replica links are flat, not domed.
Price tiers
- Under $150: printed dial, mineral glass, quartz or low grade automatic. Case 11 mm or more.
- $250 to $500: Miyota 9015, sapphire, sharper dial print. Case 9.5 mm to 10.5 mm.
- $500 to $900: unverifiable “Swiss” claims. Decorative plates over an Asian movement. Case near 9 mm.
No tier reaches 8.3 mm. No tier uses a Patek signed movement with a Geneva Seal.
US legal and customs facts
18 U.S.C. § 2320 makes trafficking in counterfeit goods a federal offense. A first offense carries up to 10 years and a $2,000,000 fine for a person. Personal purchase is not the target of that statute. Import is separate. CBP can seize counterfeit goods at the border and does not return them. A seizure notice can arrive weeks after payment.
A genuine 5711/1A has a serial on the caseback and a Patek extract from the archives. A counterfeit has neither. A jeweler with a caseback opener confirms this in minutes.
Checks before you buy anything
- Ask for caliper photos of case thickness at the lugs.
- Ask for a timegrapher photo with rate and amplitude.
- Ask for a caseback photo that shows engraving depth.
- Compare the date font to a Patek catalog photo at the same angle.
Bottom line
A replica 5711/1A copies a shape. It does not copy a movement, a service network, or a resale market. Genuine 5711/1A auction prices ran above retail after the 2021 discontinuation. Replicas resell for a fraction of what they cost. Treat a “1:1 Swiss” label as a sales term, not a spec.