The short answer

A fake Cartier Privé Tank Cintrée almost never gives itself away at the dial. It gives itself away at the profile. The Cintrée exists because of one idea from 1921: a rectangular watch that bends to follow the wrist. If the case in your hand is flat, or curved only in the lugs, you are not looking at a Cintrée — you are looking at a rectangle wearing its name.

Everything else is secondary. Print quality, hand shape, crown, movement — all of it matters, but the curve is the first gate. I check that before I look at anything else.

Why this model is unusually hard to copy

Most fake watches imitate flat surfaces, which is easy. The Cintrée is a single continuous arc through the case, the crystal, the dial, and the caseback. That means a curved sapphire crystal, a dial printed on a curved blank, and a caseback that is machined rather than stamped. Cheap workshops skip all three. They build a flat case, fit a flat crystal, and bend the lugs instead. At arm's length it can pass. On the wrist, in daylight, the light travels across it wrong and it reads as flat.

The checks, in order

  • Curve test. Lay it on a table and look from the side. A real Cintrée rocks gently on its arc. A fake sits flat or tips only at the lugs.
  • Crystal. Genuine uses curved sapphire with a soft dome. Fakes often use flat mineral glass or a poorly formed acrylic that distorts the dial at the edges.
  • Proportions. Cartier lists the large Privé Cintrée at roughly 46 mm lug to lug and 23 mm wide, around 7 mm thick. Measure the seller's numbers against that before anything else.
  • Dial printing. The railroad minute track should be crisp, evenly spaced, and continuous. On fakes the track is often thick, uneven at the corners, or broken where the printing plate was too small.
  • Hands. Sword-shaped, blued steel, properly proportioned. Replicas frequently use black-painted hands that look flat rather than blue-black.
  • Crown. The crown should be a rounded, onion-style form with a smoothly set cabochon. Glued-in or resin cabochons sit too high and catch light wrong.
  • Caseback. Held by screws with clean, concentric slots. Engraving on a real case is cut into the metal; on fakes it is often laser-etched shallow enough to catch a fingernail.
  • Weight. Precious metal has density. A gold Cintrée feels heavier in the hand than a plated brass case of the same size, and the balance point sits differently.

Movement and the inside story

The modern Privé Cintrée runs a manually wound 430 MC, a thin movement beating at 21,600 vph with a power reserve in the high 30s of hours. It is slim, and the case is slim because of it. Most fakes use a thicker automatic or a quartz module, which is exactly why so many copies end up 1–2 mm too thick. If a seller will not give you a thickness measurement, that is your answer.

Reference numbering is worth knowing too. Modern Cartier references carry a letter-code prefix, with precious-metal pieces beginning WGTA. A seller quoting a reference that does not match the metal or the model is either misreading a caseback or making one up.

The replica tiers, honestly

Not every copy is the same, and it helps to know the ladder. The bottom tier is a flat-case quartz watch with printed numerals and a plated finish — it will not fool anyone who has handled the real thing. The middle tier gets the curve and the dial right but runs thick, with dull printing and a mineral crystal. The top tier uses a curved sapphire crystal, a correctly profiled case, blued steel hands, and a decorated manual movement, and it is the only tier that survives a close look at the profile.

Even at that top tier, no replica is identical to a Cartier. The tell is always the same: the way light behaves across a genuinely curved case is expensive to produce and cheap to fake badly.

One legal note

Buying a replica for yourself is one thing. Selling one as genuine, or passing it off in a trade, is counterfeiting and it is a crime in the US and most of Europe. If you are buying secondhand, insist on papers, a service history, and a return window long enough to have the watch opened by a watchmaker.