The Rolex 40MM Cosmograph Daytona features a robust Oystersteel case with a screw-down back and crown equipped with the Triplock triple waterproofing system. The black ceramic Cerachrom bezel displays a tachymetric scale, while the scratch-resistant sapphire crystal protects the black dial with index hour markers. Powered by the Rolex Calibre 4131 manufacture movement, this mechanical chronograph offers approximately 72 hours of power reserve and includes a 30-minute counter at 3 o'clock, 12-hour counter at 9 o'clock, and small seconds subdial. The Oyster bracelet features three-piece solid links with an Oysterlock folding safety buckle and Easylink 5mm comfort extension. Water-resistant to 100 metres, this timepiece combines precision engineering with iconic design.