The Cartier Santos de Cartier Large Model Ref. WSSA0071 is a sophisticated contemporary expression of the Maison’s legendary 1904 pilot’s watch, distinguished by its striking graduated blue sunray dial that captivates with its rich, dynamic hue . This 39.8mm stainless steel timepiece features the collection’s iconic square case with rounded corners and visible screws, a design originally conceived for aviator Alberto Santos-Dumont, while the polished steel sword-shaped hands, treated with luminescent material, and classic Roman numerals ensure perfect legibility . A practical date window at 6 o’clock preserves the dial’s elegant symmetry, and the signature seven-sided crown is set with a faceted blue synthetic spinel, adding a refined touch of Cartier’s jewelry heritage . At its heart beats the reliable in-house automatic Caliber 1847 MC, a 23-jewel movement with a 28,800 vph frequency that delivers a 42-hour power reserve and is visible through the sapphire crystal caseback, underscoring Cartier’s commitment to fine watchmaking . This versatile masterpiece is secured by a stainless steel bracelet featuring Cartier’s innovative “SmartLink” adjustment system for effortless sizing, and is accompanied by an additional blue alligator leather strap with an interchangeable folding buckle, both fitted with the “QuickSwitch” system for tool-free changes to suit any occasion . With a robust 100-meter water resistance, a scratch-resistant sapphire crystal, and a slim 9.38mm profile, the WSSA0071 seamlessly transitions from formal events to casual weekends, offering discerning collectors a perfect synthesis of aviation heritage, technical sophistication, and timeless contemporary style . Key specifications: 39.8mm stainless steel case; graduated blue sunray dial; in-house Caliber 1847 MC automatic movement; 42-hour power reserve; stainless steel bracelet with blue alligator strap; 100m water resistance; sapphire crystal front and exhibition back.