150 Heritage Ultra-complication Universal Calendar

In Context

At 50 mm this is exceptionally large for something worn on a wrist, closer to a pocket watch given lugs. At 23.4 mm it is very tall, and sits high off the wrist. The sapphire crystal will resist everything short of deliberate abuse.

The movement is hand-wound, so winding it becomes part of the day rather than something the watch does for you. 60 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

75150PT.OO.01 stands on its own in this catalogue — no other reference here shares its base number. It carries a platinum case. It was a limited edition.

Calibre 1150 is a hand-wound ultra-complicated mechanical movement developed by Audemars Piguet. It comprises 1,099 components and 81 jewels, operating at a frequency of 3 Hz (21,600 vibrations per hour) with a stated power reserve of approximately 60 hours. The movement integrates a grande sonnerie Supersonnerie, minute repeater, flying tourbillon, flyback chronograph, and split-seconds chronograph, alongside a perpetual calendar with large date and astronomical moon indications. Timekeeping is displayed via central hours and minutes. Beyond its autonomous complications, Calibre 1150 incorporates a wide range of mechanised ergonomic and safety systems related to chiming, chronograph control, calendar correction, and energy management, including controlled-force chronograph reset, flyback functionality, chiming isolation during time-setting, barrel-depletion safety locks, and bidirectional correction mechanisms for the universal calendar. These systems are integrated within the movement architecture rather than relying on external modules. The calibre measures 34.3 mm in diameter and 8.9 mm in thickness, reflecting the density required to accommodate its combined acoustic, chronograph, regulating, and calendar mechanisms. The Universal Calendar mechanism itself is housed separately within the caseback and is mechanically coupled to, but distinct from, the base movement.