Audemars Piguet Ultra-Complication Universelle (RD#4)

Audemars Piguet names this Ultra-Complication Universelle, reference 26398BC.OO.D002CR.02, a white gold cased chronograph measuring 42 mm across. The case stands 15.55 mm thick and the openworked dial sits beneath a sapphire crystal. Calibre 1000 winds itself and drives an extraordinary run of complications built into one case. This chronograph pairs a minute repeater and tourbillon with a perpetual calendar, and adds a flyback function alongside a split-seconds chronograph and moon phase display. A black alligator strap closes on a folding clasp in white gold. Given the density of mechanics packed inside, the water resistance is a modest 30 metres.