Short answer

IW376024 is a real reference number from IWC's Da Vinci line. If someone is selling you a "replica Da Vinci IW376024," you are being offered a counterfeit watch, not a licensed copy and not an aftermarket build. There is no authorized version of this reference made outside IWC. The good news is that this particular reference is harder to copy convincingly than most, because the genuine movement has a dial layout that cheap chronograph movements cannot reproduce.

What the genuine IW376024 is

The reference belongs to the Da Vinci chronograph family, a stainless steel automatic chronograph with a round case, sapphire crystal, and IWC's in-house calibre 89360. That movement is the important part. IWC designed it as an integrated chronograph, and it reads differently from almost every other chrono on the market: the elapsed hours and minutes share a single counter at 12 o'clock, with two hands stacked on one subdial. Running seconds sit at 6 o'clock. There is no small seconds hand at 9, and no separate 12 hour counter at 6.

Power reserve on the 89360 runs about 68 hours, and the watch has a flyback function. Case diameter is in the low 40s in millimeters. If a listing quotes different specs, check the reference against IWC's own documentation before you trust the seller.

Why the dial layout is the fastest tell

Nearly every counterfeit chronograph on the market is built on a Valjoux 7750 or a clone of it. That movement puts a 30 minute counter at 12, a 12 hour counter at 6, and small seconds at 9. You cannot move those subdials around by reprinting a dial. The positions are mechanical, fixed by the gear train.

So when a listing shows a chronograph with subdials at 12, 6, and 9 and calls it an IW376024, you are looking at a watch that does not match the reference it claims to be, regardless of how good the case finishing looks in photos.

What typically shows up in the mail

  • Case dimensions off by a millimeter or more from the genuine spec
  • Laser etched caseback engraving instead of properly stamped or engraved marking
  • Subdial spacing that betrays the donor movement underneath
  • Crystal with the wrong anti reflective coating, or none at all
  • Clasp and spring bar hardware that does not match IWC's design
  • Boxes and papers convincing enough to fool a phone photo
  • Water resistance claims that were never tested and should not be trusted near water

Money and legal reality

A genuine IW376024 on the secondary market typically trades in the mid four figures, sometimes closer to $7,000 depending on condition, box and papers, and service history. That price gap is exactly why the counterfeit market exists for this reference.

In the United States, trafficking in counterfeit goods is a federal offense under 18 U.S.C. § 2320. U.S. Customs and Border Protection seizes counterfeit watches and other infringing goods at the border, and shipments are subject to seizure and destruction. The risk does not end at the border either. Reselling a counterfeit, or importing several of them, is where people run into real legal trouble. Servicing is its own problem: most watchmakers will not touch a counterfeit, and parts are not available, so a broken movement usually means a dead watch.

How I would check one before spending money

  • Confirm the subdial layout matches the 89360 before anything else
  • Ask for the movement photo, not just the dial photo
  • Compare the reference number and caseback text against IWC's published records
  • Request service paperwork or an independent inspection, and pay for the inspection yourself
  • Walk away from any seller who will not allow an authentication check

Legal ways to get close to the look

If what you want is a steel automatic chronograph with a clean dial and a column of real heritage behind it, the used market is deep. Older IWC chronographs from the 1990s and 2000s, plus other Swiss brands with in-house or ETA based movements, sell for far less than a new one and hold value better than any counterfeit. You get a watch that can be serviced, insured, and resold. A counterfeit gives you none of those things and carries legal exposure on top.