The short answer
A fake IW371762 is a counterfeit copy of a watch from IWC's Portugieser Chronograph family. At arm's length it can look convincing, and that is the whole problem: the tells live in small details, not in the silhouette. If you need to separate a replica from the real thing, start with four things in this order: subdial layout, dial printing, the feel of the crown and chronograph pushers, and the engraving on the caseback. Those four checks catch most fakes on their own.
What the genuine reference looks like
Portugieser Chronograph references share a family look that fakes copy first and understand last:
- Two subdials only: chronograph minutes at 12, running seconds at 6
- A slim central chronograph seconds hand that sits parked at 12 until you start the timer
- Applied numerals and thin leaf hands, not printed markers
- A thin bezel, so the dial looks wide relative to the case
- A sapphire crystal with anti-reflective coating, often on both faces
- An alligator or leather strap with an IWC pin buckle or deployant clasp
If the reference you are being shown does not match anything on IWC's own product pages, treat that as a flag before you look at anything else.
Tell #1: the subdials and their spacing
On a replica the subdials are usually the giveaway. Check that the subdial hands point cleanly at their markers at rest, that the two subdials sit on the correct vertical line, and that the small seconds hand sweeps without a visible stutter. Cheap copies often have subdials that are slightly too large, too glossy, or set too close to the centre.
Tell #2: dial printing and applied indices
Genuine printing is crisp at magnification. The brand name, the Schaffhausen line, and the reference text should all sit on the same visual weight with no fuzzy edges. Replicas tend to show thick letters, uneven spacing, and indices that are glued on rather than set into the dial. Tilt the watch under a lamp: real applied markers catch light along a sharp bevel.
Tell #3: the movement you can feel
Recent 41mm Portugieser Chronograph references use IWC calibre 69355, an automatic chronograph with roughly 46 hours of power reserve. You cannot see it from the outside, but you can feel the difference in the hand:
- Start the chronograph. The central seconds hand should step cleanly, not hesitate.
- Stop it. A genuine movement holds the hand where you stopped it.
- Press reset. A real reset snaps back to zero in one motion instead of drifting.
- Wind and set the crown. Real IWC crowns move with light, even resistance and hack the seconds when pulled.
Pushers that feel mushy or need a second press are the single most common complaint on replica chronographs.
Tell #4: caseback, engraving, and paperwork
Look at the back with a loupe if you can. Reference numbers, serials, and case material lines should be cut deep with sharp edges. Replica engraving is shallow, uses the wrong font, or carries a serial that does not match the card in the box. Where there is a display back, check the rotor lettering and the finish of the bridges. Genuine IWC finishing is soft and even; copies show machining marks and flat, painted-looking text.
Where replicas do well, and where they do not
Today's better replicas get the case profile, crystal clarity, and dial colour close. They still struggle with anti-reflective coating, the hand-finished case flanks, movement decoration, and strap quality. Be sceptical of any listing that promises Swiss movement, box, and papers at a price far below the secondary market for a genuine piece.
What to ask before buying
- Photos of the caseback and serial, in focus, not angled
- A short video of the chronograph starting, stopping, and resetting
- Whether the crystal has blue or clear AR tint under light
- Strap and buckle photos, since hardware is usually the weakest part
One practical note: counterfeits are illegal to sell as genuine, and a replica carries no manufacturer service, no warranty, and almost no resale value. Go in knowing that, and judge the watch on the checks above rather than on the story a seller tells you.