Verdict first
Buy the real one, or do not buy. A fake Cartier Tank Must yellow fails three checks a buyer can run in a store: the movement, the cabochon, and the hallmarks. A genuine Tank Must from an authorized dealer carries a serial number Cartier can verify. A fake does not.
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What the name covers
"Tank Must yellow" points at more than one watch on the resale market. Cartier sells the Tank Must in steel and in 18k gold, with lacquer dials and with roman numerals. Case sizes differ. Movements differ. Pull the reference number from the caseback and check it against Cartier's site before you compare anything. Numbers in forum posts often belong to a different model.
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Movement
Steel Tank Must models run a Cartier quartz calibre (057). Quartz is the easy part to copy because a generic Chinese module drops into the same cavity. Open the caseback and read the stamp. A real movement is marked with the calibre. A fake is blank or marked with the wrong number. Some fakes ship with a mechanical movement, which the steel quartz model does not use. Gold Tank Must references run an automatic calibre. Confirm the calibre per reference, because the gold line and the steel line do not match.
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Cabochon and crown
The crown on a real Tank Must holds a blue cabochon. Cartier uses synthetic spinel. Fakes use glass, plastic, or dyed stone. Glass shows bubbles under a loupe. Spinel does not. On a real piece the cabochon sits flush in the crown. On a fake it is often glued and stands proud of the metal. Check the crown threads too. A real crown turns with light resistance and seats square.
Gold case check
An 18k gold case has a density near 15.5 g/cm3. Brass sits near 8.5. A plated brass fake of the same size weighs close to half. Plating wears at the lugs and the caseback edge. Look there first. A magnet tells you little: 18k gold is not magnetic, and neither is brass. Weigh the watch on a jeweler's scale and compare it to a published figure for that reference.
Dial and caseback
Real dial printing is sharp at 10x magnification. Roman numerals have even stroke width. The "Swiss Made" line sits inside the minute track. Fakes show ragged edges and uneven spacing between numerals. Caseback engraving on a real watch is deep and clean. Polishing is the other tell. A caseback with soft edges and blurred text has been worked on, which usually means a plated case underneath.
Options if retail is out of reach
- Pre-owned from a dealer with papers. Below retail, verifiable serial number.
- Authorized dealer waitlist. Full price, full warranty, known history.
- Another steel Cartier model. Same brand, lower resale premium.
Skip the replica. Import and sale of counterfeit goods is illegal in the United States. Penalties under 18 U.S.C. 2320 reach $2 million and 10 years for a first offense. Customs can seize the shipment. The buyer loses the watch and the money. A replica also has no service path: no parts, no warranty, and no resale value.