A fake IW371495 is a counterfeit copy of the IWC Portugieser Chronograph, a 40.9 mm two register chronograph from the 3714 reference family. If a seller offers you one, treat it as counterfeit until proven otherwise: verify the caseback engraving, the movement, and the papers with IWC or an independent watchmaker before any money changes hands. A counterfeit is not a discount route to the real watch. It is a different product with no factory service, weak resale value, and, in the United States, real legal exposure for anyone who traffics in it.

What the IW371495 is supposed to be

You cannot judge a counterfeit without the genuine baseline. The Portugieser Chronograph in this reference family is a steel dress chronograph with a clean, legible dial and a slim profile that sits close to the wrist. The numbers below are the ones worth memorizing.

  • Case: stainless steel, roughly 40.9 mm across, about 12.3 mm thick, fully polished
  • Dial: two subdials stacked at 12 and 6, a date window at 3, applied numerals and leaf style hands
  • Movement: IWC calibre 79350, an automatic chronograph built on the Valjoux 7750 architecture
  • Crystal: domed sapphire with anti-reflective coating on both faces
  • Water resistance: 3 bar, which covers splashes and rain and nothing more
  • Strap: alligator leather on a steel folding clasp, with a lug width near 20 mm

How to check a watch that claims to be one

Case and proportions

The first tell is size. Counterfeit cases often run a millimeter or two wide and thicker than the original, because the clone movement and its spacer need more room. Put calipers on it if you can. A watch that measures 43 mm across or 15 mm thick is not this reference, whatever the dial says.

Dial layout and printing

The Portugieser Chronograph uses a 12 and 6 subdial layout. Copies sometimes use a 9 and 3 layout borrowed from a different watch, which is an immediate disqualification. On genuine dials the printing is crisp and the subdial rings sit concentric with the hands. On copies, look for soft edges on the numerals, a date font that is too round or too bold, and subdial hands that fall short of the markers they should point at.

Movement

Ask for a clear photo of the movement through the display back, or have a watchmaker open the case. A genuine 79350 shows the finishing, the rotor engraving, and the regulation system you expect from IWC. Copies tend to show an undecorated or badly decorated generic chronograph movement, often with a stamped rotor and rough perlage. The words "Swiss made" on a dial prove nothing about what sits behind it.

Caseback, serial, and papers

Reference and serial numbers are engraved, not printed, and the engraving is even and sharp. Counterfeit sets often reuse the same serial across many listings, and the accompanying box and booklet have soft, slightly off typography. Ask for the serial and a clear photo of the caseback before you discuss anything else.

Parameter bands that separate real from fake

  • Diameter: genuine about 40.9 mm. Copies often land between 41 and 43 mm.
  • Thickness: genuine about 12.3 mm. Copies run 13 to 15 mm.
  • Subdials: 12 and 6 only. A 9 and 3 layout means it is a different watch.
  • Lug width: about 20 mm. Wide looking strap gaps usually mean a larger case.
  • Weight on leather: roughly 80 to 90 grams. Copies can feel heavy or oddly light.

Pitfalls to avoid

  • Listings that crop the subdials or the crown out of every photo
  • Sellers who refuse to let a watchmaker open the case before payment
  • Serial numbers that appear in more than one listing
  • Payment pressure through wire transfer, gift cards, or crypto
  • Asking prices far under the secondary market for the reference, which is the oldest signal there is
  • Swiss movement claims with no movement photo to back them up

FAQ

Can a fake IW371495 be spotted from photos alone?

Sometimes. Dial layout and case proportions show up in good photos, but movement quality, engraving depth, and service history need hands and eyes. Treat a photo verdict as a first filter, not a final answer.

Does a counterfeit keep time?

It can run, but parts and service are the problem. Independent watchmakers may decline to work on a counterfeit, and the manufacturer will not touch it. A watch you cannot service has a short usable life.

Is buying or selling one illegal in the United States?

Trafficking in counterfeit goods is a federal crime, and counterfeit merchandise is subject to seizure at the border. That risk sits with the buyer and the seller, not only the factory.

What if I already paid for one?

Stop further payments, document everything, and try to resolve it through the payment method. If the seller described the watch as genuine, that is a fraud problem as well as a counterfeit problem.

The bottom line

A fake IW371495 is a counterfeit of a specific, well documented watch, and the gaps are measurable: diameter, thickness, subdial layout, movement finishing, and engraving quality. Measure, inspect, and verify before you commit. If any of those checks is blocked, walk away.