A fake IW938970 is a replica watch sold under a reference number that copies IWC's naming format. IWC references use the letters IW followed by six digits, so a number like IW938970 looks correct on a listing even when the watch behind it is not genuine. The reference alone proves nothing. Judge the watch: case-back engraving, movement finish, dial print, paperwork, and price are what tell you whether you are looking at an original or a first copy.
What the reference number does and does not tell you
A reference number is a catalog code, not a serial number or a certificate. Sellers of replica watches routinely invent or reuse codes that follow the brand's format because buyers search by code. Before you trust any listing, confirm the code appears in the brand's current or archived catalog, then confirm the watch in the photos matches that catalog entry in case size, dial layout, hands, and bracelet.
Serial numbers sit separately from the reference, usually engraved between the lugs or on the case back. Ask for both in a single photo so neither can be swapped in from another watch.
How to verify a watch step by step
- Request one uncropped photo showing the case back, the reference, and the serial number together.
- Match that reference against the brand's published catalog entry for case diameter, dial layout, and movement type.
- Ask for a macro photo of the dial printing and check letter spacing, thickness, and alignment at the 6 and 12 positions.
- Request a photo of the movement through the display back and compare the finish, rotor engraving, and jewel settings with known examples.
- Compare the warranty card, booklet, and box numbers with the serial on the watch.
- Check the asking price against sold listings for the same reference in the same condition.
- Confirm in writing that the seller accepts returns and states the watch is genuine or a replica.
Red flags in photos and paperwork
- Blurry case-back photos or a serial number that is cropped out of every image.
- Dial print that sits unevenly around the markers or uses the wrong font weight.
- A movement photo that shows a decorated plate over a basic quartz or low-grade automatic caliber.
- Paperwork with mismatched numbers, generic fonts, or a warranty card that was never stamped.
- A price far below the going rate for the reference with a story about urgency or a quick sale.
- A seller who will not name the watch as genuine or replica in writing.
First copy versus counterfeit: know what you are buying
The term first copy describes a replica built to imitate a luxury design, and it is not the same claim as genuine. Honest sellers label these watches as replicas and price them accordingly. The problem starts when a replica is listed under a real reference number with genuine paperwork language. In the United States, selling counterfeit goods is illegal and exposes the seller to liability, so treat any listing that hides the replica status as a risk signal rather than a bargain.
When to walk away
Walk away when the seller cannot produce the case-back photo, when the reference does not appear in the brand's catalog, or when the paperwork numbers do not match the watch. A genuine watch survives every one of these checks without excuses. A replica does not, and the seller usually knows it before you do.