No, IW938720 is not an IWC reference number. I have gone through current collections, discontinued lines, and auction archives, and nothing lines up. Real IWC references follow a tight pattern: the letters IW, then six digits that normally begin with 3, 4, 5, 7, or 8 (IW371617, IW500710, IW328201). A leading 9 does not match any IWC family I can trace. When a watch is sold as an IW938720, the number was usually invented, copied from a wholesale sheet, or lifted from a replica catalog that never had to match anything real.
How IWC reference numbers actually work
The digits are not random. The first block points to a family: Pilot's Watches, Portugieser, Ingenieur, Aquatimer, Portofino. The full number then narrows down case size, movement, and material, and a dash or suffix often flags a dial or strap variant. Once you strip a number of that structure, it stops behaving like an IWC number. IW938720 fails on the first digit, and no amount of searching turns up a spec sheet behind it.
Where this number keeps showing up
Mostly in the same few places:
- Marketplace listings using stock photos and a vague title like "IWC luxury automatic mens watch"
- Replica aggregator pages that use six digit codes as internal SKUs
- Forum and Reddit posts where someone asks whether the watch they were offered is genuine
- Invoice or certificate templates that a seller typed up themselves
The pattern is consistent. The number travels with the listing, not with a watch. That is the opposite of how a genuine reference works, because a real number is tied to a documented model you can look up in seconds.
Checks I run before paying for any IWC
- Search the reference on the brand's own site and on a large secondary marketplace. If it appears in neither, stop there.
- Put the exact number in quotes and add the word fake or replica. Reused codes leave a trail.
- Compare the case diameter, movement, and water resistance against the official spec for that family.
- Ask for photos of the caseback and the movement, not just the dial. Sellers who only have catalog images rarely have the watch.
- Sanity check the price. A new IWC chronograph does not sell for a tenth of retail from a stranger on chat.
Red flags that have nothing to do with the number
Language is a giveaway. "Super clone," "1:1," "AAA grade," or a factory nickname used as a selling point all point to a counterfeit, not a discounted original. So does a seller who pushes bank transfer, crypto, or a payment app with no buyer protection, or who gets defensive when you ask for a serial number photo. Boxes and papers are easy to print, so treat them as decoration rather than proof.
If you already bought one
Move fast. Contact your card issuer or payment platform and open a dispute while the window is open, and keep every message and listing screenshot. Take the watch to an independent watchmaker and have the caseback opened. On a fake, you will typically see a generic movement such as a cloned Valjoux 7750 or a Miyota instead of an in-house calibre, along with finishing that does not match the price you paid. That written opinion is what turns a hunch into a case.
The short version: IW938720 is not a real IWC number, and any listing built around it should be treated as fiction until proven otherwise.