The short answer

A fake IW371459 is any watch built to look like the IWC Portuguese Chronograph of that reference without coming from IWC. In the replica market you will also see it sold as a first copy, a super clone or a 1:1. Those labels describe build tiers, not a factory. The reference itself is a 41 mm stainless steel chronograph with twin subdials, no date window and a sapphire caseback. That last detail matters more than any other, because the back of the watch is where most replicas fall apart.

What the real one looks like

The IW371459 sits in the Portuguese Chronograph family, the 3714 line: round steel case, thin bezel, applied markers, small seconds at 6 o'clock and a 30 minute counter at 12. Dial color and marker style shift across the run, so check the exact variant against IWC's own reference list before you trust a spec sheet a seller wrote. If a listing claims a dial color IWC never made, stop there.

Why this reference gets copied so much

Clean dials are easy to imitate from two feet away. Nothing on the front of a Portuguese Chronograph needs a tourbillon or a perpetual calendar module, so a mid tier factory can get the silhouette close. The result is a market where the front looks fine in photos and the money has to be judged on details nobody photographs.

The tiers, in plain words

  • Fashion copy: mineral glass, printed dial, quartz or basic automatic, sold at street markets. Wrong thickness, wrong subdial spacing, wrong everything up close.
  • Mid tier: decent steel case, sapphire crystal, a Chinese 7750 based movement. Convincing across a table, weak under a loupe.
  • First copy or super clone: the top of the replica ladder. Correct case dimensions, better dial printing, engraved and striped movement plates. Even here the movement is a clone, never a real 79350.

Five things I check first

  1. Subdial spacing. Genuine dials keep both subdials tight toward the center and the hands reach the printed track. Many replicas reuse a stock movement layout and the subdials drift outward.
  2. Print quality. Stroke weight on the branding, sharpness of the minute track, and the shade of blue on blue dial versions. Replicas pad the text or use a flatter color.
  3. Case thickness. The genuine watch runs around 12.3 mm. Replicas often sit above 13.5 mm because the movement stack is taller. Ask for a photo against a ruler, or bring calipers if you can handle it before paying.
  4. The caseback. This is the big one. The real 79350 shows Geneva stripes, blued screws and a signed rotor. Clones show stamped bridges, flat gray screws and engraving that looks etched rather than cut.
  5. Pusher feel. Genuine chrono pushers are crisp with a short throw. Cheap ones feel mushy, and the reset either snaps hard or stutters.

Movement, the part photos hide

The 3714 line ran the 79350, a heavily reworked Valjoux 7750 with running seconds at 6 and chrono minutes at 12. Most replicas use a Chinese 7750 copy instead. Ask for a short video: start the chrono, let it run, then reset. The hand should snap back to zero without wobble. A shoddy clone will drift, stick or lose reset function within a year of daily wear.

Price as a filter

Used IW3714 watches trade in the low to mid four figures, and that number moves with dial color, box and papers. A first copy usually lands in the low hundreds. If someone quotes you four hundred dollars for a genuine Portuguese Chronograph with a full set, the price is the tell. If a seller prices a replica close to a used genuine, that is a different problem, and a worse one.

Questions to ask before you pay

  1. Exact reference and dial variant, with photos of both sides.
  2. Movement type, stated outright. If the answer is vague, assume a clone.
  3. Case diameter and thickness in millimeters.
  4. Crystal material, sapphire or mineral.
  5. Return window and what happens if the chrono will not reset.

The legal side

Counterfeit watches are illegal to import and sell in the United States, and customs does seize parcels. Buying one for yourself carries less risk than reselling it, but that risk is not zero, and passing a replica off as genuine is fraud wherever you stand. Know which side of that line you are on before money changes hands.