A fake IW371447 is a counterfeit copy of the IWC Portugieser Chronograph. The genuine reference is a stainless steel watch, 40.9 mm across, 12.3 mm thick, with sapphire crystals front and back, 30 m water resistance, and caliber 79350 inside. Counterfeits copy the outline. They do not copy the movement, the crystal, the case finish, or the papers.

What the IW371447 reference covers

The number sits inside the Portugieser Chronograph 3714 family. IWC built that family from 1998 until 2019, when the updated 3716 line replaced it. The 3714 run contains many dial codes. IW371447 is one of them. Dial color, hand finish, and index style change from code to code. Confirm the exact configuration for IW371447 with IWC before you judge a watch. A seller who cannot name the dial code has not done the work.

Genuine specifications to memorize

  • Case: stainless steel, 40.9 mm diameter, 12.3 mm thick
  • Crystal: domed sapphire, anti-reflective coating on both faces
  • Water resistance: 3 bar (30 m)
  • Movement: caliber 79350, automatic, 28,800 A/h, 31 jewels, 44 hours of power reserve
  • Layout: 30-minute counter at 12 o'clock, small seconds at 6 o'clock, date at 3 o'clock
  • Strap: alligator leather with a steel pin buckle or folding clasp

Counterfeit tells on the outside

  • Thickness. Most copies measure 13.5 mm to 14.5 mm because a stock chronograph movement sits underneath.
  • Crystal. Mineral glass replaces sapphire on low-cost builds. Reflections look white, not blue.
  • Subdials. The 79350 has two counters. Fakes built on a stock 7750 keep a third counter at 9 o'clock or leave a blank plate there.
  • Printing. Letter spacing in "IWC" and the weight of "Schaffhausen" run heavy or thin against the genuine dial.
  • Hands. Painted blue replaces heat-blued steel. Edges look rounded under a loupe.
  • Case back. Engraving depth is shallow and fonts differ. Reference and serial numbers are laser etched on fakes, cut deeper on genuine cases.
  • Serial numbers. Counterfeit batches share numbers. Search any number before you pay.

Movement checks

The 3714 has a sapphire display back. Remove it and the difference is plain. A genuine 79350 shows Geneva stripes, perlage, blued screws, and an engraved rotor. Counterfeit movements show plain plates, a stamped rotor, and no finishing. A timegrapher reading separates a regulated Swiss movement from a Chinese clone. Rate, beat error, and amplitude on a fake drift outside chronometer range.

Papers, box, and price

Genuine steel 3714 chronographs trade between $5,000 and $7,500 on the secondary market. Prices move with condition and service history. Counterfeits sell for $150 to $500. A "new in box" IW371447 listed at $900 is a counterfeit. Full sets include the warranty card, the booklet, the inner and outer box, and a matching serial number on card and case. Copies ship with cards that use a different number, a different font, or no number at all.

Legal status in the United States

Selling a counterfeit watch is a federal crime under 18 U.S.C. 2320. A first offense carries up to 10 years in prison and a $2,000,000 fine for an individual. U.S. Customs and Border Protection seizes counterfeit watches at ports of entry. Trademark owners can file civil claims under the Lanham Act. Buying is not a safe workaround. The watch can be confiscated, and no authorized service center will repair it.

Limits of a photo check

Two watches can look the same in a listing. Sellers reuse photos of genuine watches. Ask for dated photos of the actual case back, the movement, and the serial number. Unknown serial history, a refusal to show the movement, and a price far below market are the three strongest signals.