If you are searching for a fake IW371772, the honest buying advice is this: do not buy one. Counterfeit watches are illegal to import and sell in the United States, they carry no manufacturer warranty, no service path, and no resale value, and the money you spend is gone the moment the movement stops. If what you actually want is the look of an IWC Portugieser chronograph at a lower cost, the defensible routes are a genuine pre-owned example, a chronograph from a brand with its own design language, or a legal homage that does not copy the trademark. What follows is how to tell a counterfeit IW371772 from the real thing, and what to check before any money changes hands.

What the IW371772 is supposed to be

This reference sits in IWC's Portugieser family, a line defined by a round case, a wide and uncluttered dial, and a chronograph layout built around two registers rather than three. Because the family has been revised several times, the same reference number gets quoted with different dial colors, hands, and strap options by different sellers. Pin that down first. Get the exact reference, case material, dial variant, and production era from the manufacturer's own catalog before you compare anything else. A seller who cannot state those four details is not selling what they claim to be selling.

How to inspect a suspected counterfeit

Case and caseback

  • Proportions: genuine Portugieser cases sit in roughly the 40 to 42 mm band with a thickness near 13 mm. Copies are often a few tenths of a millimeter off, or visibly thicker because a cheap chronograph module sits under the dial.
  • Finishes: examine the boundary between brushed and polished surfaces under a loupe. Genuine transitions are crisp and straight. Copies show rounded edges and uneven brushing.
  • Engravings: reference number, case number, and hallmarks on the caseback should be cut into the metal, not printed or etched onto a plate. Check font weight and spacing against catalog photography.

Dial and hands

  • Applied indices should sit flat and reflect light evenly. On counterfeits, markers are often glued slightly off axis or sit proud of the dial surface.
  • Subdial spacing on a two-register chronograph is fixed by the movement. If the gap between the two registers does not match known examples, the movement inside is not the one being described.
  • Pushers should give a firm, defined start and stop click and a crisp reset to zero. Mushy or vague action is a warning sign that does not get better with servicing.

Movement

Ask for a clear photograph of the movement through the caseback, or a timing reading from an independent watchmaker. Genuine chronograph calibres in this family show a regulated balance with visible adjustment, a signed oscillating weight, and proper finishing under the rotor. Counterfeits typically use a stock industrial chronograph movement with a decorative cover plate, finishing that does not match the reference, and a rate that drifts well outside chronometer tolerance.

Parameter bands to compare against

  • Case diameter: about 40 to 42 mm
  • Case thickness: about 12.5 to 13.5 mm
  • Lug width: 20 mm on most variants
  • Water resistance: 30 to 60 m as stated by the manufacturer
  • Crystal: domed sapphire with anti-reflective coating on both faces
  • Power reserve: roughly 45 to 68 hours depending on calibre generation

Treat any listing that disagrees with the manufacturer's spec sheet as suspect rather than as an innocent variation. Reference numbers are exact, and so are the measurements attached to them.

Pitfalls that cost buyers money

  1. Buying from a marketplace listing with no serialized paperwork and no return window.
  2. Accepting a Swiss made claim without a movement photograph or a timing reading.
  3. Paying by irreversible transfer. A legitimate seller accepts a method that gives the buyer recourse.
  4. Trusting box and papers alone. Packaging is the easiest part of a counterfeit to reproduce and the weakest authentication signal you can rely on.
  5. Ignoring import law. Customs can seize a counterfeit shipment, and the buyer loses both the watch and the payment, with no practical route to recover either.

FAQ

Is it legal to buy a fake IW371772?

Importing and selling counterfeit goods is illegal in the United States, and watch counterfeits are an enforcement priority. Even where possession alone is not charged, the transaction has no legal protection and no remedy if the watch arrives broken or never arrives at all.

Can a watchmaker tell a fake from a real one?

Usually, and quickly. Movement architecture, case finishing, and dial printing are the three fastest tells. Budget for an inspection before you pay, not after.

Is a super clone different?

No. The term describes a higher-effort counterfeit. It remains an unauthorized copy of a protected trademark and carries the same legal and practical problems as any other fake.

What is the better alternative?

A genuine pre-owned example with service history, or a chronograph from a brand with its own design language. Both can be serviced, both hold value, and neither risks seizure at the border.