Audemars Piguet Ultra-complication Universal Calendar

Audemars Piguet's Ultra-complication Universal Calendar, reference 75150PT.OO.01, is a platinum-cased chronograph measuring 50 mm across and 23.4 mm thick. The blue enamel dial sits under a sapphire crystal and is paired with a hand-made platinum chain rather than a conventional bracelet. Inside is the manual-winding calibre 1150, a hand-wound movement that combines a minute repeater and flying tourbillon with a perpetual calendar. Audemars Piguet also builds in a flyback split-seconds chronograph and moon phase display, alongside an astronomical Universal Calendar mechanism that tracks solar and lunar cycles. This is a limited edition, produced in only two platinum examples. No water resistance figure is published for this piece, and its case is better judged on its mechanical density than on any depth rating.