The short answer

"Replica Portofino 37" refers to copies of the IWC Portofino Automatic 37, a Swiss dress watch with a 37 mm case. The genuine watch comes from IWC Schaffhausen. Copies come from factories with no link to IWC and carry no manufacturer warranty. In the US, selling or importing them is a federal offense.

The genuine reference

  • Model: IWC Portofino Automatic 37, reference family IW4581.
  • Case diameter: 37 mm. Case height: about 9 mm.
  • Movement: IWC calibre 35111, self-winding, 42-hour power reserve, 28,800 vibrations per hour. Some current references list calibre 32111.
  • Crystal: sapphire, anti-reflective coating on both sides.
  • Water resistance: 3 bar.
  • Strap: leather. IWC lists Santoni straps on several references.
  • Retail price: roughly 5,000 to 8,000 USD. Diamond-set references cost more.

What a copy contains

Sellers copy the case shape, the dial layout, the applied numerals and the logo. The movement inside comes from a third-party supplier, most often in China. Case steel, hand finishing and gasket quality differ from the genuine item. No independent lab certifies the materials, the alloy or the water resistance of a replica. Sellers do not publish factory names, serial data or pressure test results.

Legal status in the US

Trafficking in counterfeit goods is a federal crime under 18 U.S.C. § 2320. Importing goods that carry a counterfeit mark is barred by 19 U.S.C. § 1526. US Customs and Border Protection inspects and seizes shipments of counterfeit watches. A buyer of a seized shipment loses the goods and has no legal claim for the money paid.

Checks on any listing

  1. Ask for the reference number and compare it with the IWC catalog.
  2. Ask for a case back photo. Genuine Portofino 37 backs carry an engraved reference and serial.
  3. Ask for a movement photo. Copies do not match the finish of calibre 35111.
  4. Ask for a pressure test record. A 3 bar rating needs a tested case.
  5. Ask for the seller's return address and business registration.

What is known and what is not

The genuine watch is documented by IWC: dimensions, calibre and materials are published. The origin, alloy and test status of a specific replica are not documented. Seller pages give claims, not test data. Treat any replica listing as unverified.