Short answer
The string IW938578 follows the IWC reference format: the letters IW plus six digits. IWC Schaffhausen publishes its collections under prefixes such as IW32, IW37, IW39, IW45, IW50 and IW51. A search of IWC's public catalog returns no product page for IW938578. Without a confirmed original, a listing titled "replica IW938578" is a name typed into a product feed, not a copy of a watch that exists.
How IWC reference numbers work
IWC prints two numbers on each case back. They do different jobs.
- Reference number: IW plus six digits. It identifies the model, for example IW371617.
- Case serial: seven or eight digits. It identifies one individual case.
- Caliber: printed on the movement and on the warranty card, for example 69355 or 32111.
- Dial text: brand name, Schaffhausen, and the function line such as Automatic or Chronograph.
A real reference number returns a page on IWC's site with case size, movement, and production years. A number with no page has no spec sheet to compare against.
What a replica listing contains
Listings for IW938578 and similar numbers share a pattern.
- Price between 80 and 400 US dollars.
- Photos pulled from auction archives or dealer sites, not photos of the item shipped.
- Movement described as Japanese automatic or Swiss ETA with no photo of the movement.
- 316L steel case, mineral crystal instead of sapphire, and a weight 20 to 40 grams below the original.
- No box, no papers, no serial match to the engraving.
Sellers use words like 1:1, AAA, and Swiss grade. These words have no standard, no inspection body, and no published test.
Risks
Customs
US Customs and Border Protection can seize goods that carry a counterfeit trademark under 19 U.S.C. 1526. The buyer loses the item and the money in most cases. Shipments from China and Hong Kong get flagged at higher rates.
Payment
Card networks ban transactions for counterfeit goods. Sellers ask for wire transfer, cryptocurrency, or gift card codes. None of these methods offers a chargeback.
Service and resale
IWC service centers do not accept counterfeit watches for repair. Independent watchmakers can replace a battery or a gasket, but parts for a fake movement are not in any catalog. Resale value on the secondary market is zero.
Checks before any purchase
- Type the reference number into IWC's site search. No result means stop.
- Ask for a photo of the case back with the reference and serial legible.
- Compare the serial range against the production years for that model.
- Ask for a photo of the movement with the caliber number visible.
- Compare the asking price to sold prices on watch auction databases. A genuine IWC from the last 20 years sells for four figures or more.
Bottom line
IW938578 has no confirmed IWC original. A replica under that number carries customs seizure risk, no warranty, no service path, and no resale value. Buyers who want the look of a steel sports watch at a low price have legal options from brands such as Seiko, Orient, and Tissot.