The Cartier Santos is a historic and iconic watch collection by Cartier, known for its square case with rounded corners, exposed screws on the bezel, Roman numeral dial, and often featuring a blue cabochon crown. Originally created for aviator Alberto Santos-Dumont, the collection has evolved over the years while maintaining its distinctive design elements. For the latest models and details, it’s recommended to check Cartier’s official website or visit an authorized Cartier dealer.