Short answer
A fake Cartier Tank Must is a watch built to copy the Cartier Tank Must that Cartier released in 2021. Cartier does not make it and does not sell it. Copies turn up on marketplaces, at street markets, and on social media. The tells sit in the dial print, the crown, the caseback engraving, the strap, and the papers. Photos settle some questions. A watchmaker with the caseback open settles all of them.
What the real Tank Must is
Cartier launched the Tank Must in 2021 as the entry model of the Tank line. The cases are steel. Two sizes ship in the standard range:
- Large: 33.7 mm by 25.5 mm
- Small: 29.5 mm by 22 mm
Both run on quartz. A SolarBeat version charges from light and ships on a strap made from apple waste. The 2021 release added red, blue, and green dials with matching straps. The dial carries Roman numerals, a minute track, sword-shaped hands, the word Cartier at 12 o'clock, and Swiss Made at 6 o'clock. Reference numbers begin with WSTA. Cartier sets retail in the low thousands of US dollars for the steel models. Prices change. Check the current figure with Cartier.
Where copies differ
- Dial print. Numerals on copies run thick and sit off center. The minute track lines touch the numerals.
- Hands. Real hands have a polished bevel at the edge. Copies use painted hands with a blunt tip.
- Crown. The real crown is fluted and set with a blue spinel cabochon. Copies use glass or plastic that reads purple in low light.
- Caseback. Real engraving is cut deep with sharp edges and matches the reference number on the certificate. Copies show shallow laser etching and numbers that do not match the papers.
- Case finish. Real cases have sharp edges where the brancards meet the case body. Copies show rounded edges and a wide gap at the lugs.
- Strap. Real leather has a set stitch count and a Cartier stamp on the lining. Copies use thinner leather and uneven stitching.
- Thickness. Measure the case and compare it with the figure Cartier publishes for that reference.
Serial numbers and papers
Cartier does not run a public serial number lookup. No website returns a result when you type in a Tank Must serial. A boutique or an authorized service center can check a watch during service. Copies reuse one serial number across many units. If two listings show the same number, treat both as suspect. A real Tank Must ships with a box, a certificate, and a warranty card. The reference number on the certificate matches the caseback.
Price and the law
Counterfeit watches sell for a small fraction of retail. The price is the first signal. In the US, trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320. A first offense by an individual carries up to 10 years in prison and a $2,000,000 fine. The statute targets sellers. Importing a counterfeit watch is barred, and US Customs and Border Protection can seize it at a port of entry. A buyer who imports a copy can lose the watch, the shipping cost, and the payment sent. Resale is a second problem. Pawn shops, auction houses, and trade-in programs refuse watches without matching papers.
Checks you can run
- Ask for a caseback photo taken at an angle. Real engraving has depth.
- Compare the reference number on the caseback with the number on the certificate.
- Look at the crown cabochon. A real spinel has a dome. A copy reads flat.
- Measure the case and compare the numbers with the published figures.
- Ask a watchmaker to open the caseback and read the movement caliber.
- Request a service receipt or a Cartier invoice if the seller claims a service history.
What this guide cannot do
No photo guide proves a watch is real. Casebacks and movements get copied. A quartz movement in a copy can keep time as well as the original. Only a hands-on inspection by a watchmaker or a Cartier service center answers the question.