The perceived simplicity of a watch can sometimes conceal extraordinary mechanical complexity.

Unveiled in 2023, the Code 11.59 by Audemars Piguet Ultra-Complication Universelle RD#4 is one of the most complicated watches in the world, with 40 functions, including 23 complications. This monumental undertaking mobilised five watchmakers, dozens of specialists, and required seven years of development.

The aim was to create the most user-friendly and ergonomic ultra-complicated watch ever made. With a diameter under 42 mm, a weight of less than 180 g, and a remarkably legible dial grouping all calendar indications into apertures, this watch marks a milestone in the quest for ergonomic excellence.

Three crowns and three push-pieces are all that are needed to set all its functions. Each crown controls several different functions and is connected to a considerable number of components. Their sophisticated design has earned them the nickname “super crowns”. Take the one at 4 o'clock, for example, which controls four distinct functions:

• Advancing the month in sync with the year (clockwise rotation),

• Reversing the month in sync with the year (counterclockwise rotation),

• Flyback of the running chronograph (a press),

• Resetting the stopped chronograph (a press).

To secure the system, the chronograph cannot be activated while calendar corrections are underway.

Integrating so many functions into such a small space demanded exceptional ingenuity. The split-seconds mechanism was positioned at the same level as the oscillating weight to save thickness, and the dial itself serves as a bridge. The number of components was also reduced, with the movement performing all functions using just over 1,100 components.

The name of this timepiece pays tribute to the 1899 "Universelle” pocket watch, a masterpiece featuring 19 complications. Weighing 600 grams, it incorporated 14 adjustment devices, including a crown, a trigger-piece, six levers and six push-pieces. Designed to showcase technical mastery, it was never intended for daily wear. Today, it is on display at the Musée Atelier Audemars Piguet.

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