Audemars Piguet's reference 25594ST, launched in the early 1990s, represents an evolution of the Royal Oak with a complete calendar complication, including day, date, month and moon phases. Housed in a 36 mm steel case, it retains Gérald Genta's iconic design with an octagonal bezel and integrated bracelet, powered by the automatic calibre 2124/2825, derived from the JLC 889, enhanced with additional complication modules.
This second-hand example Audemars Piguet reference 25594ST boasts the following features: