Short answer: a fake Portofino Midsize 39 is a counterfeit watch presented as an IWC Portofino Midsize, and the "39" is usually a seller's rounded case-size label rather than an official IWC reference. The dependable way to confirm the model is to match the reference number on the caseback against the specifications IWC publishes.

What the "Midsize 39" label means

IWC has used "Midsize" for smaller Portofino Automatics, and that case is generally quoted at about 37 mm. Listings that advertise a 39 mm Portofino Midsize may be measuring across the crown, describing a different reference, or selling a replica case built to a generic size. Case diameter is one of the few things a buyer can verify at home with calipers, so treat any unexplained size claim as a reason to slow down.

How to check a Portofino Midsize before you buy

  • Reference number. Ask for the full reference and compare it with the brand's own product page. Counterfeit sellers often reuse one reference across several dial colors.
  • Case measurements. Measure the case at its widest point with the crown excluded, then compare against the published figure.
  • Dial printing. On authentic dials the brand name and "SCHAFFHAUSEN" sit on a consistent baseline, with even spacing and crisp applied indices.
  • Hands and date. Leaf-shaped hands should be thin and polished, and the date font should match the rest of the dial typography.
  • Caseback engraving. Reference, serial, and material markings are cut to even depth. Shallow laser etching appears on many replicas.
  • Movement. Compare finishing, rotor engraving, and jewel count with the caliber the reference is meant to use.
  • Papers and history. A matching box, warranty card, and service record tell you more than any photo of the dial.

Red flags in online listings

  • A price far below the going rate for that reference.
  • Stock images instead of macro photos of the caseback and movement.
  • Pressure to pay through a method with no buyer protection.
  • Vague answers about serial numbers or service history.
  • Claims about Swiss quality with no movement details attached.

Why the authentic watch is the better purchase

A genuine Portofino keeps resale value, can be serviced by the manufacturer, and carries a warranty that a replica never will. Counterfeit watches also carry legal risk: importing or selling them can lead to seizure and penalties, and independent watchmakers rarely have access to parts for a copy movement. If the budget is the issue, a clean pre-owned example from a reputable dealer is the safer route to the same look.

Where to buy with confidence

  • Authorized dealers and brand boutiques, for a new watch with full coverage.
  • Manufacturer-certified pre-owned programs, which include inspection and a warranty.
  • Established auction houses that publish condition reports and provenance.
  • Independent authentication before payment on any private sale.

Bottom line

Any listing for a fake Portofino Midsize 39 is selling an unverifiable copy, and the size in the title is often the first thing that does not add up. Verify the reference, measure the case, inspect the movement and paperwork, and buy from a source that stands behind the watch.