Short answer

IW938137 does not match any reference number in the IWC catalog. IWC reference numbers use the prefix IW followed by six digits, for example IW371446 or IW500705. The string 938137 carries eight digits and turns up in replica listings and in serial number search pages. Treat it as a seller code or a fabricated number. It is not a model identifier.

How IWC numbering works

IWC keeps two numbering systems apart.

  • Reference number: IW plus six digits. It names the model family and, with suffixes, the case metal and dial variant.
  • Serial number: a separate string engraved on the caseback. It identifies one watch. It does not follow the reference format.

A seller who lists "IW938137" as a model name has mixed the two systems or invented a number. Replica sellers do this to slip past trademark filters on marketplaces.

Where "IW938137" appears

Searches for the code return three types of pages: marketplace listings for replica IWC watches, forum threads from buyers asking for a verification, and serial number lookup tools that return no match. No entry on iwc.com matches the code.

Six checks on a suspect IWC

  1. Reference number. Compare the code on the papers and the caseback against the IWC catalog. If the number runs eight digits after the IW prefix, stop there.
  2. Caseback engraving. Genuine engraving is cut or laser marked with clean edges. Replica engraving shows shallow cuts, uneven letter spacing, and rounded corners on the text.
  3. Movement. Compare the rotor engraving, the finishing, and the beat rate against the caliber listed for that reference.
  4. Dial printing. Check the stroke weight of "Schaffhausen" and the index alignment at 12 o'clock. Replicas show thick strokes and markers that sit off center.
  5. Papers and box. IWC paperwork carries the reference number and the serial number. Both must match the watch in hand.
  6. Price. A current Portugieser or Pilot's watch at 10 percent of retail price is not a genuine watch.

What to ask the seller

  • Photos of the caseback at an angle, under light.
  • The full reference number and serial number, in writing.
  • Service history and the name of the watchmaker who serviced it.
  • A return window in writing.

A visit to an IWC boutique or service center settles the question. IWC service centers check a serial number against factory records.

Bottom line

IW938137 is not a real IWC reference. Buyers who see the code in a listing should read it as a sign of a counterfeit or replica watch, then run the six checks above before sending money.