Short answer: A fake Clé de Cartier 4106 is a replica of Cartier's Clé de Cartier dress watch sold under the 4106 seller code, which resellers use for the mid-size stainless steel automatic model. It is judged on four things: the key-shaped crown, the case profile, the dial printing, and the movement inside the case.
What the 4106 code actually refers to
Cartier introduced the Clé de Cartier in 2015, and the brand identifies the collection with reference codes that begin with WSCL. The number 4106 is not part of that system. It is a catalogue code used by replica sellers and their buyers to point at one configuration: stainless steel case, automatic movement, and either a steel bracelet or a leather strap.
That detail matters when you search. A listing titled fake Clé de Cartier 4106 tells you which factory tier and which case size the seller has in mind, but it says nothing about the genuine watch's paperwork, service history, or market value.
Why this model is hard to copy well
The defining feature is the crown. "Clé" means key in French, and the crown is cut to look like the head of a key, set with a sapphire cabochon. A replica has to reproduce the silhouette, the cabochon color, the fit against the case flank, and the feel when the crown is turned. Most low-grade fakes fail on at least two of those.
Five checks that expose a low-grade replica
- Crown shape and action. The key head should look machined rather than stamped, and it should sit against the case with no visible gap or wobble when you turn it.
- Case profile. The Clé de Cartier case is thin with a curved lug line. Replicas often run thicker, which changes how the watch sits on the wrist.
- Dial printing. "Cartier" and "Swiss Made" should be crisp under a loupe. Fuzzy edges and inconsistent letter height are the usual giveaway.
- Hands and date window. Blued steel hands should look blued, not painted, and the date aperture should be cut square with even spacing.
- Case back engraving. Reference numbers, serials, and hallmarks are etched on genuine watches with a fine, even line.
Movements found in first copy watches
The genuine Clé de Cartier runs on an in-house Cartier automatic. Replicas at the top of the market use a Japanese or Swiss automatic, while cheaper examples use a Chinese movement that keeps time but is louder and rougher to wind. Ask what movement is inside before you compare prices, since the same case can be offered with three different engines.
Legal and practical notes
Selling counterfeit watches is illegal in the United States and in most of the European Union, and shipments are seized at the border. Buyers are rarely prosecuted, but a fake Clé de Cartier has no resale value, cannot be serviced by Cartier, and carries no warranty. Treat any purchase as a costume piece rather than an investment.
If your goal is to know what you are looking at, compare any candidate against photos of the genuine WSCL references and check the crown first. That single detail settles most of the question.