Quick answer

There is no solid gold Cartier Tank Must. The Tank Must that Cartier relaunched in 2021 is a steel watch with a quartz movement and a leather, steel, or SolarBeat strap. Cartier's gold Tank is the Tank Louis Cartier, made in 18k yellow or rose gold. The vintage Must de Cartier line sold from the 1970s into the 1990s was vermeil, meaning gold plating over sterling silver. So a listing that advertises a "gold Cartier Tank Must" is describing one of three things: a gold plated Must de Cartier, a steel Tank Must with a gold tone case, or a counterfeit. Only the first can be genuine, and it is plating, not solid gold.

What the genuine watch is

The Must de Cartier was an entry level line built to sell at a lower price than the solid gold Tanks. Cases were vermeil, dials were lacquered, and movements were quartz. The modern Tank Must follows the same idea in steel. A seller who claims a current production Tank Must has an 18k case is either misinformed or selling a fake.

How to check one, step by step

  1. Ask for the caseback reference number. Modern Tank Must references are steel models. Tank Louis Cartier references in 18k gold use different numbers. Match the reference to the claim.
  2. Weigh the watch on a kitchen scale. A vermeil Must de Cartier is lighter than a solid 18k Tank of the same size. Gold plated brass fakes feel hollow and light.
  3. Look inside the caseback for French hallmarks. Solid 18k gold carries the eagle head stamp. Vermeil sterling carries the Minerva or boar head mark for silver. No hallmark on a claimed gold case means it is not gold.
  4. Inspect the crown cabochon. Genuine watches use a blue spinel set in a matching crown. Fakes use resin or glass, often too bright, too large, or set at a wrong angle.
  5. Study the dial print with a loupe. Roman numerals should be sharp, the minute track even, and the hidden Cartier signature sit inside the VII or X. Fakes show thick print and misplaced signatures.
  6. Check the hands. Genuine sword hands are blued steel with sharp tips and correct length. Fakes are painted blue, with burrs and rounded tips.
  7. Open the case and read the movement. Must de Cartier quartz calibers are signed and stamped. Fakes use unbranded movements or carry the wrong signature for the model.
  8. Check the strap and buckle. Genuine leather is alligator or calf with tight stitching, and the buckle is signed. Fakes use bonded leather and roughly stamped hardware.

Red flags that decide the sale

  • Gold tone that is identical on a 30 year old watch, which suggests a re-plate or a fake.
  • Plating worn thin at the lugs, caseback edge, and crown, which is normal on genuine vermeil and common on old fakes too.
  • Solid gold claimed at a few hundred dollars. An 18k Tank Louis sells new in five figures and used in four to five.
  • Serial numbers that do not match between caseback and paperwork.
  • A seller who refuses close photos of the caseback interior or the crown.

Before you pay

Counterfeit watches are seized at the U.S. border, and trafficking in counterfeit goods is a federal offense. If a gold Cartier is your goal, buy a documented Tank Louis Cartier or a vermeil Must de Cartier from a seller who shows hallmarks, movement photos, and matching papers.