Quick answer
The Cartier Tank Must Black is a steel quartz watch with a black lacquer dial. Cartier launched the Tank Must line in 2021 and used it to replace the Tank Solo. Replica versions sell for $80 to $400. Price does not track accuracy. Case size, dial finish, and movement type are the three checks that separate a close copy from a poor one. In the United States a replica is a counterfeit good. Customs can seize it.
Genuine specs to compare against
- Case: steel, rectangular, curved sides. Large model 33.7 mm by 25.5 mm, 6.6 mm thick. Small model 29.5 mm by 22 mm.
- Dial: black lacquer with white printed Roman numerals. No date window.
- Hands: polished steel sword hands.
- Movement: quartz. Battery life about 8 years.
- Crystal: sapphire.
- Crown: steel with a blue spinel cabochon.
- Water resistance: 3 bar.
- Strap: black calfskin, or a steel bracelet on bracelet references.
- List price: about $3,200 on leather, about $3,700 on steel. Prices move by year and market.
Why this model is copied so much
The case is small, the dial is flat, and the watch has no complications. The genuine movement is quartz, so a replica with a quartz movement matches the real architecture. No date wheel, no chronograph pushers, no moon phase. Fewer moving parts means fewer details for a maker to get wrong. That is the reason a $150 copy of this model can look closer to the original than a $150 copy of a complicated watch.
Checks before you pay
- Measure the case with calipers. A large model that reads 36 mm is not a large model.
- Look at the dial under direct light. Real lacquer has depth and a soft sheen. Cheap copies use flat matte paint.
- Confirm the movement type. A Tank Must copy with an automatic movement is a different watch in a Tank case.
- Check for a date window. Any date aperture means the dial is wrong.
- Inspect the crown. Blue glass or blue paint is common on low tier units. The genuine stone is a spinel cabochon with a domed top.
- Read the caseback. Reference number, serial, water resistance, and Swiss Made text sit in sharp engraving.
- Ask for photos of the exact unit with a dated note in frame. Stock photos prove nothing.
Price tiers in the replica market
Three bands exist. Under $120 buys a quartz copy with a printed dial and a mineral crystal. From $150 to $300 buys closer case dimensions and a sapphire crystal. Above $300 buys the closest dial finish and bracelet work, but the gap to the sub-$300 band is smaller than sellers claim. Shipping and payment method add risk at every tier. Card payments can be reversed. Bank transfers and crypto cannot.
Legal status in the United States
Cartier holds the Tank trademark. A replica is an infringing copy. Under 19 U.S.C. 1526, U.S. Customs and Border Protection can seize and forfeit counterfeit watches at the border, and can assess a civil penalty. Resale adds exposure under the Lanham Act and, for repeat sellers, criminal liability under 18 U.S.C. 2320. Buying one watch for personal use is a lower risk than selling, but the item can still be taken.
What no guide can confirm
No source verifies a specific seller. Replica production runs change without notice, so a good unit today can be a bad unit in six months. Photos hide dial texture, crown height, and bracelet fit. Treat any claim of "1:1" or "mirror quality" as marketing with no standard behind it.