The Cartier Santos de Cartier is one of the most important watches in history, introduced in 1904 as the world’s first purpose-built wristwatch. Designed for aviator Alberto Santos-Dumont, it featured a square case, exposed screws, and a bold design that has remained iconic for more than a century. Modern Santos models retain these signature details while offering automatic Swiss movements, interchangeable bracelets, and a range of sizes in stainless steel, gold, and two-tone options. Both sporty and elegant, the Cartier Santos de Cartier is one of the most collectible Cartier watches for sale today, valued by enthusiasts for its heritage, style, and enduring innovation.