Continuing with the releases for its 150th anniversary, Audemars Piguet has returned to the format that preceded the wristwatch yet remains central to the Manufacture's most ambitious technical expressions. The Audemars Piguet 150 Heritage Ultra-Complication Universal Calendar pocket watch, reference 75150PT.OO.01, in platinum, stands as a direct descendant of Le Brassus’s legendary ultra-complications: the 1899 L’Universelle and the 1921 La Grosse Pièce, pieces that established the brand's mastery of astronomical complications and grande sonnerie mechanisms, and which are in the Audemars Piguet Musée Atelier.