A replica Patek Philippe 3700/11 is a third-party copy of the Nautilus Jumbo, the steel sports watch Patek Philippe launched in 1976. It mirrors the case profile, the integrated bracelet and the horizontal dial texture of the original, but it is not a Patek Philippe product, it carries no factory warranty, and selling it as a genuine watch is counterfeiting under US law.
What the original 3700/11 is
The reference 3700 is the first Nautilus, a 42 mm steel sports watch built around a thin automatic movement. Patek Philippe gave it a porthole-shaped case, a rounded octagonal bezel and a bracelet that flows out of the case without visible lugs. The watch was designed in the mid-1970s by Gérald Genta, whose name is attached to several other integrated-bracelet designs of that decade.
Inside sits the caliber 28-255 C, a slim automatic movement that Patek Philippe developed from the Jaeger-LeCoultre 920 base. That movement is one reason the original sits so flat on the wrist. The whole watch is under 8 mm thick, which is unusual for a 42 mm case from that era.
Patek's reference system uses a slash suffix to describe the bracelet or strap fitted to a watch, so 3700/11 and 3700/1 point to the same Jumbo case and movement in different fittings. Production of the 3700 ran into the early 1980s before the smaller 3800 took over as the main Nautilus offering.
What a replica 3700/11 tries to copy
- Case profile. The two-part construction, the thin bezel and the shoulder line where the case meets the bracelet.
- Integrated bracelet. Hinged links that taper toward the clasp with no gap at the lugs.
- Dial. The horizontal groove pattern, applied baton markers and the printed signature.
- Proportions. A 42 mm width paired with a slim case, which is the hardest part to imitate.
- Closed caseback. The original has a solid back, so nothing inside is visible to the eye.
Where replicas fall short
Thinness is the first tell. Copy cases often run a millimetre or two thicker than the original, and the extra height shows in the way the watch sits on the wrist. Bracelet fit is the second. On a genuine 3700 the end links meet the case with tight, even gaps, and the taper is gradual. On most replicas the links feel light, the clasp is stamped rather than milled, and the transitions between links look coarse.
The dial is the third area. The embossed horizontal pattern on the original has depth and a soft satin finish that shifts with the light. Printed copies tend to look flat, and the marker edges catch light in a different way. Because the caseback is closed, the movement is not visible, which is the main reason the 3700 is easier to imitate on the outside than a watch with an exhibition back.
How to tell a replica from an original
- Weigh it. Steel Nautilus cases and bracelets carry a heft that copies rarely match.
- Check the crown. It should sit flush in the case band and carry the correct emblem.
- Read the engraving. Reference numbers, case numbers and hallmarks are crisp and consistently placed on genuine pieces.
- Inspect the bracelet screws and links for a clean finish and correct sizing.
- Ask for an Extract from the Archives, which Patek Philippe issues for a fee and which lists the original date of sale and configuration.
- Compare against auction results for the reference, since a genuine 3700 trades in a well-documented range.
Legal and practical points for US buyers
Counterfeit watches are illegal to import and sell in the United States. US Customs and Border Protection can seize shipments of counterfeit goods, and a seller who passes a replica off as a genuine Patek Philippe exposes themselves to trademark claims. Beyond the legal side, a replica cannot be serviced by Patek Philippe, holds no collector value, and cannot be authenticated or resold through an auction house.
If you are researching the 3700/11 because you like the design, the useful information is what the reference is, how it was built, and where the copies fail. Those details are the same ones that matter when someone hands you a watch and asks whether it is real.