The short answer
Most fake Must de Cartier Tank watches fail in three places: the case metal, the dial print, and the caseback stamps. Genuine examples from the 1977 to early 2000s run used a vermeil case, meaning .925 sterling silver plated with about 20 microns of gold. Reproductions use brass or gold-tone steel, so the case feels light, sounds tinny when tapped, and wears to a hard yellow-white edge instead of the soft rub-through of real plating. Pair that with a muddy dial signature, a plastic-looking crown cabochon, and caseback engraving that does not follow Cartier's format, and you have enough to walk away.
fake must de cartier tank question where to buy
Before you start
- A 10x jeweler's loupe
- A kitchen scale accurate to 0.1 g
- Saved photos of a verified example in the same case size
- The seller's asking price and a copy of the listing photos
How to check a Must de Cartier Tank
- Ask the seller for a straight-on photo of the caseback before anything else.
- Look at the lug tips and caseband edges under the loupe and note any wear.
- Weigh the watch head and compare it to a verified example of the same size.
- Read the dial signature at 10x and check the letter spacing letter by letter.
- Inspect the Roman numerals and the minute track for thickness and alignment.
- Examine the crown cabochon for color depth, surface polish, and how it sits in the fluting.
- Compare the caseback engravings to the reference number the seller quoted.
- Request a movement photo and confirm the caliber marking matches the era of the watch.
- Check the strap and buckle for signed hardware and period-correct stitching.
- Compare the price against recent sold listings for the same reference and condition.
What the case metal should tell you
Vermeil is the tell. Real Must de Cartier cases are silver underneath, so a strong magnet test does nothing and the case feels denser than brass. Where the gold has worn thin on a genuine piece, you see silver, not copper or grey steel. Fakes show a yellow-white base metal at the corners and on the caseback rim. A real case also carries a fine, even polish on the bezel flats, while cast copies show soft edges and ripples under magnification.
Dial and crown details
The printed signature should be crisp with even stroke weight and no ink bleed into the graining of the dial. The sapphire cabochon on the crown is domed, deep blue, and set flush; fakes use flat glass or dyed plastic that reads purple under light. On the dial, check that the numerals sit level with the minute track and that the printing does not fade at the edges of the chapter ring.
Caseback stamps and serials
A genuine caseback typically carries the Must de Cartier marking, the metal designation for silver and gold plating, a reference number, and a serial. The engraving is cut, not laser-etched, so it has depth and slightly raised edges. Reproductions use shallow etching with rounded letterforms, and the reference number often does not correspond to the case size or dial layout in front of you.
Where buyers get caught
- Buying from a listing with only front-facing photos and no caseback shot
- Accepting a price far below recent sold results for the same reference
- Trusting a box and papers set that was assembled from separate pieces
- Confusing the 2021 steel Tank Must revival with vintage vermeil models
When to walk away
If the seller refuses a caseback photo, will not confirm the metal, or cannot explain the serial, stop there. On a vintage Must de Cartier Tank, the authentication lives in the metal and the engraving, and both are cheap to photograph. No photo, no sale.