The Audemars Piguet Royal Oak Selfwinding Ref. 15400ST.OO.1220ST.03 is the quintessential modern luxury sports watch, embodying the iconic design introduced in 1972 by Gerald Genta in a perfectly proportioned 41mm stainless steel case . This legendary timepiece features the collection’s signature octagonal bezel secured by eight hexagonal white gold screws, which frames a stunning blue “Grande Tapisserie” dial with a captivating waffle-like pattern that creates a mesmerizing interplay of light and depth . The blue dial, a highly sought-after variation that was originally available only through Audemars Piguet boutiques, provides a rich backdrop for the applied white gold hour markers and Royal Oak hands, both coated with luminescent material for effortless legibility . At its heart beats the in-house automatic Caliber 3120, a movement of exceptional craftsmanship comprising 280 components, including a 22-carat gold oscillating weight, visible through the sapphire crystal caseback, which delivers a robust 60-hour power reserve . The watch is completed by its seamlessly integrated stainless steel bracelet, famed for its alternating satin-brushed and polished finishes that catch the light with every movement . With a slim 9.8mm profile and 50-meter water resistance, the 15400ST, launched in 2012 to mark the 40th anniversary of the Royal Oak, perfectly bridges the collection’s heritage with modern sensibilities, making it an essential and highly collectible centerpiece for any discerning collector . Key specifications: 41mm stainless steel case; blue “Grande Tapisserie” dial; Caliber 3120 automatic movement; 60-hour power reserve; integrated stainless steel bracelet; 50m water resistance; sapphire crystal front and back.