Short answer

IW938907 does not appear in the IWC Schaffhausen reference catalog. IWC numbers carry the prefix IW and six digits. No model in the brand's published list matches 938907. Pages that rank for "fake iw938907" come from replica sellers, from mistyped reference numbers, or from scraped listings that copy one string across many products.

Treat any listing that uses this number as unverified. There is no factory model to compare it against.

How IWC reference numbers are built

An IWC reference has two parts. The prefix "IW" is fixed. Six digits follow. The first four digits name the family. The last two name the version, the case metal, or the dial.

  • Portugieser Chronograph family: IW3716
  • Pilot's Watch Chronograph family: IW3881
  • Portofino family: IW3565

A number such as 938907 does not match any family IWC lists in its public catalog. Buyers who find it in a listing are looking at a string with no counterpart on the brand side.

Why a number like this spreads

  • Typing errors. Digits get dropped or swapped when someone copies a reference from a photo caption.
  • Listing reuse. Some sellers paste one reference into many product pages, so the string repeats on unrelated watches.
  • Placeholder codes. Some wholesale sheets use internal SKUs that look like references.

Checks that settle the question

  1. Search the number on the brand site. If it returns nothing, the number is not an IWC reference.
  2. Search auction archives and dealer databases. These carry past references that the brand site drops.
  3. Read the caseback. Genuine engraving is crisp and matches the papers.
  4. Compare the movement to the caliber named in the listing.
  5. Check the price against the secondhand market for the real model.

Red flags

  • A seller refuses to send photos of the caseback or the movement.
  • The listing uses several reference numbers for one watch.
  • Papers, box, and caseback serial numbers do not match.
  • Stock photos come from the brand's own site.

What is not known

No public record ties IW938907 to a released IWC model. If a seller claims the number belongs to an unreleased or private edition, ask for the caliber, the case size, and the year. Those details can be checked against archive data.