The Audemars Piguet Royal Oak Extra Thin Flying Tourbillon (RD#3) 50th Anniversary Steel Blue Dial 39mm Ref. 26670ST.OO.1240ST.01 marks a milestone in the Royal Oak collection. This 39mm stainless steel model is the first “Jumbo” Royal Oak to feature a selfwinding flying tourbillon, powered by the ultra-thin Calibre 2968 movement, measuring just 3.4mm thick. The case stands at only 8.1mm high and is paired with a glareproofed sapphire crystal and exhibition caseback. The blue dial showcases the signature “Petite Tapisserie” pattern, complemented by white gold hour markers and Royal Oak hands with luminescent coating for optimal legibility. A matching stainless steel bracelet with AP folding clasp ensures a secure and comfortable fit. Water resistance is rated to 50 meters. Notable features include the ultra-thin flying tourbillon, anniversary edition status, and the iconic Royal Oak design, making this reference a standout for collectors and horology enthusiasts.