A fake Cartier Tank Must in yellow is a replica of Cartier's entry-level Tank, built on a case that has been plated with yellow gold. The genuine Tank Must that Cartier relaunched in 2021 comes in steel only, so a "yellow gold Must" points to either a gold-plated replica or the vintage Must de Cartier from 1977. That single fact settles most of the questions buyers ask.

What Does "Yellow" Mean on a Tank Must?

Yellow describes the case finish, not a Cartier production reference. Three very different watches get lumped under that label.

  • Yellow-gold plating on a steel replica. The most common setup in the replica market. A steel case is electroplated, and the tone runs from pale champagne to a brassy orange depending on plating thickness and the alloy used.
  • Vintage Must de Cartier vermeil. The original 1977 Must used a sterling silver case plated with 20 microns of gold, stamped "ARGENT" and "PLAQUE OR G20M".
  • Solid yellow gold. That is Tank Louis Cartier and Tank Française territory, not the Must line.

How the Genuine Tank Must Is Built

Cartier sells the Tank Must in three sizes, all in steel, with a silvered opaline dial and blued steel sword hands. Case dimensions are fixed across the range, so a listing that quotes odd numbers is a warning sign.

Tank Must sizes and movements

  • Small: 29.5 x 22 mm, quartz.
  • Large: 33.7 x 25.5 mm, quartz.
  • XL: 41 x 31 mm, automatic (Calibre 1847 MC).

Cartier also made a SolarBeat version with a photovoltaic movement and a strap made from apple waste. It sits in the same steel case.

Details that separate real from replica

  • Crown: a blue spinel cabochon on steel pieces, faceted and set flush to the case.
  • Dial: the word CARTIER is woven into the VII numeral as a secret signature.
  • Caseback: engraved reference and serial numbers, plus a steel hallmark.
  • Glass: sapphire on genuine pieces. Many replicas use mineral glass that scratches and reflects a different tone.
  • Strap: real Must leather straps are stitched to a fixed width, and the buckle carries the Cartier mark.

How to Check a Yellow Tank Must Replica Before You Buy

Replica quality varies more than the photos suggest. Ask for these five things and the answers tell you most of what you need to know.

  1. Caseback and crown photos in daylight. Plating tone, engraving depth, and cabochon shape are all visible there.
  2. Weight in grams. Gold plating over steel feels lighter than a solid gold case of the same size.
  3. Movement type. The Small and Large Must are quartz, so a smooth sweeping second hand is wrong for those sizes.
  4. Clasp and buckle close-ups. Poor plating flakes first at the buckle tongue and the lug edges.
  5. Strap material. Bonded leather cracks within weeks, and the strap is the first part to fail on any replica.

What Drives the Price of a Replica Tank Must

Price tracks materials, not branding. Three tiers show up in most listings.

  • Entry: plated alloy case, mineral glass, generic quartz movement. Looks right in a photo and wears out fast.
  • Mid: 316L steel case, thicker plating, sapphire glass, cleaner dial printing.
  • Higher: closer case geometry, correct crown cabochon, accurate Roman numeral weight, and a movement that matches the size it is fitted to.

No replica comes with a Cartier service card, so any listing that promises an official warranty or boutique servicing is false.

Legal and Practical Risks in the United States

Selling counterfeit watches violates US trademark law under 18 U.S.C. 2320, and US Customs and Border Protection can seize counterfeit goods at the border. Buyers take the same seizure risk on imports, plus a watch no jeweler will service or resell.

Gold plating also wears. Expect visible base metal at the lugs, caseback edge, and crown within months of daily wear, and plan for a replating cost that can approach the price of the watch itself.

FAQ

Did Cartier ever make a yellow gold Tank Must?

No. The 2021 Tank Must is steel. The closest original is the Must de Cartier from 1977, which used a gold-plated silver case rather than solid gold.

Is a yellow Tank Must fake by definition?

Not always. A vintage Must de Cartier with 20-micron gold plating is genuine and yellow. A modern "yellow gold Tank Must" with a quartz movement is a replica or a mislabeled Tank Louis Cartier.

How can I tell gold plating from solid gold?

Look for hallmarks. Plated pieces carry stamps such as "PLAQUE OR G20M" or "ARGENT", while solid gold carries a purity mark like 750 or 18K. Weight and wear points tell the same story.

Does a replica Tank Must keep time well?

Most quartz replicas hold time within a few seconds a month. The weak points are the case, the plating, and the strap, not the movement.