Short answer
Cartier reference numbers follow one format: the letter W, then six digits or letters, as in W1556361 or W6920046. The string "4266" does not match that format. Cartier does not list a Rotonde de Cartier model under that number. In replica listings, "4266" works as a seller code, a stock number, or a note about case size. Treat it as shorthand from the seller, not as a factory reference.
What a Rotonde de Cartier is
Rotonde de Cartier is a round-case line. Sizes run 40 mm to 42 mm in steel or 18k pink gold. Case details include a fluted crown with a blue cabochon, a guilloché dial, Roman numerals, and blued steel sword hands. The sapphire caseback carries engraved reference, serial, and metal hallmarks. Cartier lists several Rotonde models with the 1904 MC and 1847 MC in-house calibers.
How the search phrase works
The phrase "fake rotonde 4266" joins a brand term with a seller code. Results lead to replica storefronts, forum threads, and video reviews. Sellers in this market invent their own numbers because no public catalog covers replica output. One seller's 4266 can map to a different watch at another seller. Ask for case diameter, movement name, and photos of the caseback before you compare two listings.
Checks that matter
- Caseback engravings. Genuine Cartier stamps are crisp and level. Replica stamps show shallow cuts and uneven letter height.
- Cabochon. Cartier sets a blue spinel or synthetic sapphire in the crown. Replica stones sit in epoxy and show a milky edge under light.
- Movement. Genuine Rotonde watches use Cartier calibers with engraved bridges. Replica cases hold generic Asian automatic movements, or quartz in the cheapest tier.
- Hands. Genuine sword hands are blued steel with a mirror polish. Replica hands show a paint layer and blunt tips.
- Weight. A gold case carries more mass than plated brass. A kitchen scale shows the gap. Ask the seller for a photo of the watch on the scale.
Price and movement
Genuine Rotonde de Cartier watches sell from about $6,000 for steel into six figures for high-complication pieces. Replica sellers list $150 to $700 for the same visual layout. The gap tracks the movement. Asian automatic movements cost sellers $20 to $60. Cartier has no widely cloned in-house caliber, so no replica carries a true 1904 MC.
Unknowns
Cartier publishes no 4266 reference. No factory document ties that number to a Rotonde model. If a seller claims 4266 as a Cartier reference, ask for a catalog page. Nothing public supports the claim.