The Cartier Tank Louis is the signature model of the iconic Tank collection and the purest expression of Louis Cartier’s original 1917 design. Recognized for its rectangular yellow gold case, elongated Roman numerals, and blue sapphire cabochon crown, the Tank Louis embodies the refined elegance that has made Cartier a leader in Swiss luxury watchmaking. Powered by either precise quartz or Swiss automatic movements, the watch is offered in multiple sizes to suit different collectors and preferences. Its clean proportions and timeless details have made it a favorite among cultural icons and discerning buyers for more than a century. Today, the Cartier Tank Louis remains one of the most important Cartier watches for sale, celebrated by collectors as a definitive example of lasting craftsmanship and design heritage.