The short answer
IW938907 is not an IWC reference number. It is a dealer or wholesaler SKU, the kind of code that shows up in replica catalogs to track a batch. If you searched that string, you are looking at an inventory label, not a watch model. Nothing about it tells you the movement, the case size, or the factory.
Why the code looks official
IWC reference numbers carry an "IW" prefix and a digit block tied to a product family. That block matters, because it is how the brand, dealers, and service centers sort parts. A "93" prefix does not line up with anything IWC has published. Replica sellers borrow the look of a reference number because it makes a listing feel grounded. The prefix gets copied, the digits get invented, and the result looks close enough that most buyers never check.
What the code probably points to
When a wholesaler assigns something like IW938907, it usually stands for one of three things:
- A batch number, so the seller can pull the same watch from stock twice.
- A factory tag, so repeat buyers can ask for "the one I got last time."
- A variant marker, often dial color or strap, so two similar listings do not get mixed up.
None of those are quality signals. A tidy code says nothing about whether the watch keeps time.
What I check before paying
Ignore the code and ask about the watch itself.
- Movement: a known clone caliber with a name, or something unnamed. Ask for the exact designation.
- Case: diameter, thickness, and lug width in millimeters. Compare against the genuine spec sheet.
- Photos: dated, on a plain surface, crown and caseback visible. Stock images mean nothing.
- Caseback engraving: reference format, serial pattern, font weight. This is where budget builds fall apart.
- Returns: written terms, not a promise typed into a chat window.
The legal side
Selling counterfeit watches is illegal in the United States and across most of Europe, and an imported one can be seized at the border. Individual buyers rarely face charges, but they do lose money and packages. Customs agencies publish seizure figures every year, and the Swiss watch industry pushes hard for enforcement. That is worth knowing before you wire anything.
Bottom line
Treat IW938907 as a label, not a model. Ask the seller what the code maps to, then judge the watch on the movement, the dimensions, and the photos. If the answer stays vague, the code was never the point.