Answer first: "IW93811" does not behave like a documented IWC reference number, and most listings using it are a scrambled code, a mistyped catalogue number, or a string invented by a replica seller to avoid brand filters. No photo and no model string can confirm a watch on their own. The checks that hold up are the engraving on the caseback, the movement inside the case, the paperwork that shipped with it, and an in-person inspection by a watchmaker who services the brand.
Start With the Reference Number Itself
IWC reference numbers follow a fixed pattern, and the manufacturer publishes its catalogue so any number can be checked against it. A string that appears nowhere in that catalogue, or that only appears on marketplace listings, forum posts and replica storefronts, is the first thing to doubt. Counterfeit sellers often shift a digit or two in a genuine reference so the search results land on their page instead of the real model. Write the number down from the listing, then compare it to the engraving on the caseback of the actual watch. If those two disagree, the conversation is over.
- Pros: free, fast, and works on any watch you can physically hold.
- Cons: a good fake can engrave a correct number, so a match is not proof by itself.
Use this check first when a seller sends you photos and a model name before you ever see the watch.
Fake IW93811 Watch vs. Original: Key Differences
Read the Dial and Case Details
Look at the printing under magnification. Genuine dial text is crisp with even spacing; counterfeit printing tends to smear at the edges or sit slightly off-center. Check the date window alignment, the lume application, and whether the hands sweep smoothly or tick once per second, which points to a cheap quartz movement rather than a mechanical one. Case finishing is the other tell: genuine brushed and polished surfaces meet at a sharp, defined line, while replica cases often round that transition off.
- Pros: catches most low and mid-tier counterfeits without opening the watch.
- Cons: high-end fakes copy dial printing closely, so this alone is not conclusive.
Use dial and case inspection as a screening step, not a verdict.
Look at the Movement and Caseback
An authorized watchmaker can open the case and identify the movement in minutes. Genuine in-house movements carry signed rotors, consistent finishing and engravings that match the reference. Many counterfeits hide a generic third-party movement behind a decorated plate. Caseback engravings, reference and serial placement, and the font used are also worth comparing side by side with a known genuine example.
- Pros: movement identification is the most reliable single check available.
- Cons: requires a professional, a case opening, and usually a small fee.
Use this route whenever the amount of money involved is significant or the paperwork is missing.
Weigh the Price, Box and Papers
A price far below the going rate for the same reference, a box that feels flimsy, a warranty card with no dealer stamp, or paperwork that lists a different reference than the watch are all common warning signs. None of them proves anything alone, but they stack up. Ask the seller for the original purchase receipt and the dealer name, then verify that the dealer exists.
If You Already Bought One
- Stop wearing it and photograph it from every angle, including the caseback and any paperwork.
- Keep the listing, messages and payment records together.
- Have a watchmaker document what the movement actually is in writing.
- Report the seller to the marketplace and, where money was lost, to the payment provider.
Importing counterfeit goods is illegal in the United States and shipments can be seized, so buying from an overseas replica store carries real risk beyond losing the purchase price.