The short answer
IW93857 is not an IWC reference number. IWC builds its references as the letters IW followed by six digits, the way you see on a Portugieser or a Pilot's Chronograph. A five-digit string like 93857 does not match that pattern, and it does not appear in IWC's own product archive.
So the code is a label a seller typed into a listing, not a factory designation. It shows up on marketplace pages and on replica listings, where it functions as an internal stock number. It says nothing about the movement, the case, or where the watch came from.
How IWC references actually work
Genuine references carry six digits after the IW prefix. The leading digits usually group watches from the same family or era, which is why you see clusters like 3716, 3777, or 5007 repeated across a model line. A dealer who knows the brand can read that structure at a glance.
When a listing shows a code that breaks the pattern, that is your first signal. It does not prove the watch is counterfeit on its own. It does mean the seller either made the number up or copied it from a source that did.
Why invented codes keep appearing
- Unique strings rank in search. A made-up code gets its own results page with no competing noise.
- Rotation avoids takedowns. When a listing is pulled, the seller reissues it under a new code.
- It borrows authority. A model number makes a listing feel like a catalog entry rather than a classified ad.
I look at the code last, not first. The photographs and the seller's history tell you far more.
What to check instead
- Case back engraving. Reference numbers on genuine IWC watches are crisp, evenly spaced, and consistent with the case metal.
- Movement finish. Replica movements often show rough edges, mismatched screws, and rotor engraving that does not match the brand's style.
- Dial printing. Look at the spacing in the logo and the thickness of the indices under a loupe or a phone macro shot.
- Papers and service history. A receipt from an authorized service center is hard to fake and easy to verify.
- Price. If the number is a fraction of the secondary market for that model, the listing has already told you what it is.
What "first copy" describes
Tier language in this market is marketing, not a standard. "First copy," "AAA," and "Swiss grade" are terms sellers invent to sort their own inventory. There is no grading body, no registry, and no way to confirm which factory built a given watch. Two examples sold under the same phrase can come from completely different workshops with different movements and finishes.
That is worth knowing before you compare two listings and assume the higher price buys a better watch.
The legal side, briefly
In the United States, selling counterfeit goods is trademark infringement and carries civil and criminal exposure. Shipments get seized by customs, and payment processors routinely freeze accounts tied to replica sales. Buyers usually face less risk than sellers, but a watch with no warranty and no resale channel is not an asset. It is a costume piece.
Bottom line
If you searched for fake IW93857, you were probably trying to work out whether a listing was legitimate. The code itself answers nothing. Treat it as a seller's shorthand, then judge the watch on the case back, the movement, the paperwork, and the price. Those four things will tell you the truth long before a string of digits does.