What a fake IW371772 is
A fake IW371772 is a counterfeit watch built to look like the IWC Portugieser Chronograph reference IW371772. The genuine watch is a stainless steel chronograph in IWC's Portugieser line, with a clean dial, two subdials, and an IWC chronograph movement. The counterfeit copies the case shape, dial text, and logo, then sells for a small fraction of the real price. IWC did not make it, did not authorize it, and will not service it.
The reference number matters here. IWC prints it on the paperwork, the warranty card, and the caseback, and engraves it between the lugs. A seller who calls a watch "IW371772" is claiming one specific model, so the details on the watch have to match that model exactly. Most fakes fall apart on that comparison.
What the real IW371772 should look like
Before you judge any watch, pull the official spec sheet for that reference. IWC publishes case size, thickness, dial variants, strap options, and movement details for each reference.
- Stainless steel case, roughly 41 mm across, with a thin polished bezel.
- Two-register chronograph layout: running seconds at 6 o'clock, chronograph minutes at 12 o'clock.
- No date window. A Portugieser Chronograph of this family has no date aperture, and a date hole is one of the fastest tells.
- Applied numerals and feuille hands, with crisp edges and even lume fill.
- An IWC chronograph movement, visible through a sapphire caseback, with the rotor engraving and finishing you can inspect under light.
Prerequisites before you inspect a watch
- A 10x loupe or a phone camera with a macro mode.
- A digital caliper for case diameter and thickness.
- A small kitchen scale for weight comparison against a known genuine example.
- Official reference photos open on a second screen.
- A watchmaker who will open the caseback for a fee.
How to check a watch sold as IW371772
- Look up the reference on IWC's own catalog and confirm the dial color, strap, and case metal for IW371772. Write down the spec.
- Measure the case with calipers. Compare diameter and thickness to the published numbers. Replica cases run thick or slightly large.
- Inspect the dial under magnification. Check the weight of the logo lettering, the sharpness of the printed minute track, and the alignment of the subdials to the center line.
- Confirm there is no date window. Look at the 3 o'clock position and the 6 o'clock position, where fakes often add one.
- Read the engraving between the lower lugs with the loupe. Genuine engraving is shallow, even, and clean at the edges. Fake engraving looks stamped, deep, and ragged.
- Check the caseback engraving depth and the sapphire crystal fit. Look for glue residue or a gap around the crystal edge.
- Start the chronograph and reset it several times. Note the pusher feel and whether the reset snaps to zero instantly.
- Weigh the watch. A fake is usually lighter than the real piece on the same strap, though strap material changes the number.
- Have a watchmaker open the back. Compare the movement finish, rotor engraving, and caliber marking with IWC's photos.
- Ask for the original warranty card, box, and purchase receipt, then call an IWC boutique to confirm the serial against the paperwork.
Common mistakes on fake IW371772 copies
- Subdials spaced too wide or too narrow for the case size.
- Logo and dial text that look heavy, glossy, or slightly too large.
- Hands that are flat where the genuine hands have a defined center ridge.
- Chronograph pushers that feel mushy or grind on the press.
- Caseback engraving that is deep enough to catch a fingernail.
- Generic movements with no IWC marking, or markings that are laser printed instead of engraved.
- Wrong strap stitching, wrong buckle stamping, or a tang buckle on a reference that ships with a deployant.
Risks of buying or owning a counterfeit
Counterfeit watches are illegal to sell in the United States, and customs officers seize them at import. You get no manufacturer warranty, no parts support, and no resale value. A watchmaker who spots a fake movement may refuse to work on it, and a jeweler will not take it in trade. If you buy one believing it is genuine, your remedy is a civil claim against the seller, and recovery depends on finding that seller again.
If you already own a watch that turns out to be a fake IW371772, do not list it as genuine. Have a watchmaker document the findings in writing, then pursue the seller with that report.