Cartier Tank Must Steel Leather

The Tank Must is Cartier's leaner, lighter reading of the original 1917 Tank silhouette, and this 25mm small model pairs a steel case with a black grained leather strap rather than the metal bracelets seen on the larger Tank references. The rectangular case and railway-track minute markers are unchanged from the Tank's earliest form, which is part of why the line has stayed in continuous production longer than almost any other watch design still sold today. Cartier revived the Must name specifically for this more accessible steel line, distinct from the solid gold Tanks the house also produces at a considerably higher price point.

At small model size, the Tank Must sits close to the wrist and reads as understated rather than sporty, closer in spirit to jewellery than to a tool watch, and the blue sapphire cabochon set into the crown is a detail carried over from the model's earliest references in the early twentieth century. The black leather strap is the classic pairing for the model and the one most requested, since it keeps the case as the only visual statement rather than competing with a metal bracelet for attention, and the interchangeable QuickSwitch strap system fitted to recent generations lets it be swapped without tools.

Because the Tank Must is produced in genuinely large numbers relative to Cartier's other lines, sourcing a clean example is usually more straightforward than with the brand's sports models like the Santos, though strap and buckle condition vary a great deal piece to piece and are checked closely before anything is confirmed to a client. Every piece is reviewed through Legit Grails, with condition documented and shared directly before you commit. Enquire to discuss this piece and its current condition.