Fake IW371475: the short answer

If someone offers an IWC Portugieser Chronograph IW371475 below the going rate for a complete pre-owned example, treat the watch as counterfeit and walk away unless the seller can show the reference number stamped between the lugs, a matching movement photo, and a service history that traces back to the brand or a known watchmaker. Counterfeit IWC watches ship with boxes, booklets, and hang tags that look correct in photos, so the only reliable filter is documentable provenance plus an in-hand inspection. Buy the seller first and the watch second.

Verify the reference before anything else

The reference number is the anchor for every other check. On the Portugieser Chronograph it is engraved between the lugs at the 12 o'clock side and repeated on the caseback. Match the full number, not just the first four digits, against the brand's published records, and confirm the case metal, dial color, and strap option listed for that exact reference. Counterfeiters print a real reference number on a watch whose dial or case finish never existed in that combination. If the number on the case does not match the number on the paperwork, stop there.

Case and crystal checks

  • Measure the case. The Portugieser Chronograph case in this family runs about 40.9 mm across and roughly 12 mm thick. Counterfeit cases drift a millimeter or two larger, and the extra bulk shows at the lugs.
  • Look at the crystal edge. Genuine sapphire sits near flush and shows a faint blue or purple tint from anti-reflective coating on both faces. Fakes use mineral glass or coated sapphire with a harsh green cast.
  • Check the crown. It should seat without wobble and carry a crisp embossed logo. Loose crowns and shallow engraving are common on counterfeit cases.
  • Inspect the caseback engraving under a loupe. Genuine text has sharp, even strokes. Fakes show rounded edges, uneven spacing, and faint double lines from a worn stamp.

Dial, hands, and subdials

Dial work is where most counterfeit IWC watches fall apart. Look at the applied numerals and indices: they should sit flat, catch light on the beveled edges, and align with the printed minute track. Leaf-shaped hands should be polished with no burrs at the tips. The subdials at 12 and 6 should both move when the chronograph runs. A counterfeit that hides a non-working subdial behind a decorative hand is a common trick, as is a date window with the wrong font or an off-center aperture.

Movement and function

  • Run the chronograph. Pushers should have firm, short travel with a clean click. Reset should snap to zero with no bounce.
  • Watch the seconds hand. A sweeping beat tells you the movement is mechanical, yet counterfeiters use low-grade chronograph clones that also sweep. Feel matters more than sweep.
  • Check the date change. It should flip clean in a short window near midnight, not creep for two hours.
  • Look at the rotor through a display back. Genuine finishing shows even Geneva stripes, clean perlage, and engraved text with sharp borders.

Parameter bands to compare

  • Case size: about 40 to 41 mm across, about 12 to 13 mm thick for this reference family.
  • Water resistance: 30 m on the classic Portugieser Chronograph. A seller who claims 100 m is describing a different watch.
  • Power reserve: roughly 44 to 46 hours on the older chronograph caliber, longer on newer in-house movements.
  • Crystal: sapphire, front and back on display-back versions.
  • Strap: alligator or calf leather with a signed pin or folding clasp. Stamped steel clasps with soft edges are a warning sign.

Common pitfalls

  • Buying from a marketplace listing with stock photos and no shots of the serial or reference stamp.
  • Trusting paperwork. Boxes and booklets are copied, and blank warranty cards are sold on their own.
  • Accepting a Swiss made claim at face value. That marking is printed on counterfeit dials with no legal basis.
  • Paying by wire or gift card, which removes any chance of a chargeback.
  • Ignoring import rules. Counterfeit watches are seized at the border, and the buyer absorbs the loss.

FAQ

Is a fake IW371475 worth buying?

No. A counterfeit has no resale market, no manufacturer service, and no parts support. Repairs fall to independent watchmakers who may refuse the job. Add the risk of seizure at import and the effective cost is higher than a genuine pre-owned watch.

Can a jeweler tell the difference?

A watchmaker with the case open can tell in minutes. From the outside, a trained eye needs the watch in hand under magnification. Photos alone are not enough.

What should I ask a seller?

Ask for the full reference number, a photo of the engraving between the lugs, a movement photo, the date and place of purchase, and any service records. A seller who cannot answer these questions is not a seller you should pay.

How do I protect myself when buying genuine?

Buy from an authorized dealer or a pre-owned specialist, pay with a method that offers recourse, and get an independent inspection during the return window. Confirm the reference against the brand's own records before you commit.