Short answer

Patek Philippe does not make a Nautilus with reference 1300L. That number does not appear in the brand catalog, in auction records, or on service paperwork. The Nautilus line runs on references 3700, 3800, 5711, 5712, 5726, 5980, 5990 and 5811. Listings that use 1300L are typos, invented numbers, or shorthand from counterfeit sellers.

Where 1300L comes from

Two patterns show up in search data. First, a mistyped 5711/1A or 5711/1A-010, the steel Nautilus that Patek discontinued in 2021. Second, a batch code used by replica factories to label production runs. Counterfeit factory codes look like letters and numbers, for example N1, PPF or 3K. A string like 1300L fits that habit better than it fits Patek numbering.

Patek reference numbers use four or five digits plus a suffix for case metal and bracelet type. The suffix 1A means steel case and steel bracelet. The suffix 1G means white gold. Codes 010, 014 and 018 mark dial variants. There is no L suffix in the Nautilus line.

Real Nautilus references and specs

  • 3700/1A: 1976 launch, 42 mm, cal. 28-255 C, steel.
  • 3800/1A: 37.5 mm, mid-size, cal. 335 SC.
  • 5711/1A: 40 mm, 8.3 mm thick, cal. 324 S C, then cal. 26-330 S C from 2019.
  • 5712/1A: 40 mm, power reserve and moon phase, cal. 240 PS IRM C LU.
  • 5726/1A: 40.5 mm, annual calendar, cal. 324 S QA LU 24H.
  • 5980/1A: 40.5 mm, chronograph, cal. CH 28-520 C.
  • 5990/1A: 40.5 mm, chronograph with travel time, cal. CH 28-520 C FUS.
  • 5811/1G: 41 mm, white gold, cal. 26-330 S C, released 2022.

Market facts for the 5711

Patek stopped the 5711/1A in 2021. The 5711/1A-014 has an olive green dial. The 5711/1A-018 has a Tiffany blue dial and a run of 170 pieces. Auction results for steel 5711 examples with papers sit in the mid five figures to low six figures in US dollars. Tiffany dial examples have sold for over $1 million. Counterfeit copies of the 5711 sell for $300 to $1,200, and those prices move with factory batches.

How to read a listing

  • Check the reference against Patek records or a published auction catalog.
  • Ask for case measurements in millimeters. A 5711 measures 40 mm across and 8.3 mm thick. A 42 mm case labeled 5711 is wrong.
  • Look at the caseback. Steel Nautilus cases carry a reference, a serial and hallmarks.
  • Compare the bracelet. On the 5711 the Nautilus bracelet tapers from 25 mm at the lugs to 18 mm at the clasp.
  • Ask for a photo of the movement. The 5711 shows a gold rotor and the Patek seal.
  • Treat any listing that spells the reference as 1300L as unverified. No factory, dealer or auction house uses that number.

Legal position in the United States

Counterfeit watch sales are illegal in the US. 18 U.S.C. § 2320 covers trafficking in counterfeit goods and sets a maximum of 10 years for a first offense. US Customs and Border Protection can seize shipments. A buyer who keeps a counterfeit for personal use faces lower risk than a seller, but the item can still be seized at import.