The Audemars Piguet Royal Oak Selfwinding "50th Anniversary" Rose Gold Diamond Blue Dial 37mm Ref. 15551OR.ZZ.1356OR.02 merges heritage-inspired aesthetics with technical refinement, presented in a 37mm 18-carat pink gold case. Its slim 9.1mm profile and diamond-set bezel, adorned with 40 brilliant-cut diamonds totaling approximately 0.92 carat, highlight the watch’s luxurious character. The iconic Bleu Nuit, Nuage 50 “Grande Tapisserie” dial is enhanced with pink gold applied hour markers and luminescent Royal Oak hands, referencing the original 1972 design. Powered by the next-generation selfwinding Calibre 5900, viewable through a sapphire caseback with a commemorative "50-years" pink gold oscillating weight, the watch offers a 60-hour power reserve and central hours, minutes, seconds, and date functions. The integrated 18-carat pink gold bracelet and AP folding clasp add comfort and cohesive design. Water resistance is rated at 50 meters, ideal for daily sophistication with enduring craftsmanship.