Audemars Piguet unveils a new edition of the Royal Oak Perpetual Calendar Ultra-Thin, first introduced in 2018 as the thinnest of its kind. The new edition is presented in full titanium (case, bezel, and bracelet) and with a twist of its beautiful blue dial. With a case height of just 6.2 mm, the 41-mm watch lives up to its name. The same rings true for the self-winding manufacture caliber 5133, which was first introduced in 2017 and is a mere 2.9 mm thick.

Comprising of 256 parts, this workhorse features a special design that positions the functions of the perpetual calendar, which are usually placed on three separate levels, on a single plane. This new technical feat led to the development of two patented innovations: the integration of the end-of-month cam with the date wheel and the association of the month cam with the month wheel. To further reduce thickness, the dial also acts as a bridge.  
The Royal Oak Perpetual Calendar Ultra-Thin introduces a new smoky-blue dial developed especially for this model. Light in the center and dark around the rim, it is decorated with a sunburst motif endowing it with luminous aesthetics. The deep background hue make the calendar indications, month and leap year at 3 o’clock, date at 6 o’clock, day and day/night indicator at 9 o’clock all the more legible.  

The moon phase at 12 o?clock is the only indication whose design has not been modified from the previous model. The dial remains punc...