Quick Answer
IW938907 does not match any reference in IWC Schaffhausen's published catalog, and authorized dealers do not list it in current stock. The code copies IWC's post-2011 format of "IW" plus six digits, so it looks plausible at a glance, but a plausible format is not proof of a real watch. Treat any piece stamped with this number as a replica or a mislabeled item until an IWC boutique or a factory-trained watchmaker confirms otherwise.
What the Code Tells You
An IWC reference number points to one specific model, case material, dial variant and movement. When a number cannot be matched to a catalog entry, the watch is either a fantasy reference invented by a replica factory or a genuine case that has been re-engraved. Both carry risk. A fantasy reference has no parts support, no service history and no resale path through a dealer. A re-engraved case may hold a genuine movement inside a counterfeit shell, which makes the deception harder to spot from photos alone.
Prerequisites
- A 10x jeweler's loupe or a phone camera with macro mode
- Digital calipers that read in metric
- The seller's photos, listing text and any paperwork
- Access to IWC's official catalog page or an authorized dealer
How to Check a Watch Stamped IW938907
- Look up the reference number in IWC's own catalog and ask an authorized dealer to confirm it. If neither source recognizes the number, stop and treat the watch as counterfeit.
- Measure the case with calipers across the 4 o'clock to 10 o'clock line, crown excluded, and compare the result with the closest real reference. Replica cases run 0.3 to 1 mm off spec.
- Photograph the caseback engraving through the loupe. Genuine IWC engraving has crisp, uniform stroke depth. Replica engraving looks shallow, rounded or laser-dotted.
- Record the serial number from the caseback, the movement bridge and the warranty card. All three must match. One mismatched number means parts were assembled from different sources.
- Inspect the movement through a display back. Look for the caliber number, the rotor engraving and the surface finish. Replica movements use stamped text and coarse perlage.
- Check the dial printing at 10x. Genuine indices and text hold sharp edges with no ink bleed. Replicas show fuzzy edges and markers that sit off-center at 12.
- Tilt the crystal under a lamp. IWC uses double-sided anti-reflective coating, so glare stays muted with a blue or purple tint. A strong white or green flare points to a replacement crystal.
- Compare price against retail and check the paperwork. A current-production IWC at 20 percent of retail, sold with no box or papers by a private seller, fits the counterfeit pattern.
- Weigh the clasp or deployant in your hand. Genuine hardware has a solid, damped action and tight folding joints.
- Take the watch to an IWC boutique or an independent watchmaker who services Swiss brands. Ask for a written authenticity opinion before you pay, or before you return it.
What to Do If You Already Bought One
Contact the seller in writing and request a refund under your payment platform's item-not-as-described policy. Keep the listing screenshots, the chat history and the shipping label. If the seller refuses, file a dispute with your card issuer and report the listing to the marketplace. Importing or selling counterfeit watches is illegal in the United States, and customs officers can seize shipments.
Buying Decision
If you want an IWC look at a low price, buy from a seller who labels the watch a first copy or replica in the listing. A watch described as a replica is a different proposition from one sold as genuine behind an unverifiable reference number. Pay for the design, not for an authenticity claim the code cannot support.