Ultra thin perfection! The Audemars Piguet Royal Oak RD2 26586TI 1 of 200 pieces!

The perpetual calendar is an emblematic complication, deeply tied to Audemars Piguet’s history. In 1875, even before the brand’s workshop was established, a pocket watch made by Jules Audemars already featured a perpetual calendar. In 1955, the brand introduced the first perpetual calendar wristwatch with a leap-year indicator, a key improvement that made it easier to set. Later on, the ultra-thin calibre 2120, based on a Jaeger-LeCoultre ébauche, gave life to some of the most elegant perpetual calendar watches produced from the 1960s through to the late 2010s.

Presented as part of its Research and Development series in 2018, the RD2 was the thinnest perpetual calendar ever made and won the Aiguille d’Or, the most prestigious award in watchmaking. This led to a first titanium and platinum piece introduced in 2019, followed by the full titanium version presented here in 2023. These ultra-thin perpetual calendars are highly complex and produced in very limited numbers, often no more than a few hundred pieces.

Despite having 256 components, the calibre 5133 remains less than 3 millimeters thick. This is especially remarkable given that the watch also features a moonphase, a day-and-night indicator, and, most importantly, a full-size rotor. To achieve this, Audemars Piguet watchmakers completely reimagined the movement architecture. The traditional three-level construction has been transformed into a single plane, and the dial is even used to support part of the movement. Running at 2.75 hertz, the calibre delivers 40 hours of power reserve.

Visible through the sapphire caseback, the movement features extensive hand-finishing, as seen, for example, in the numerous interior angles on the rotor. While the caliber is highly innovative in its construction, Audemars Piguet has applied traditional finishing techniques throughout, resulting in a restrained and timeless elegance.

In this version, both the case and integrated bracelet are crafted from grade 5 titanium, a material that makes perfect sense for such an ultra-thin watch. With satin-brushed surfaces and polished bevels, the result is an exceptionally light watch, weighing approximately 75 grams. Measuring 41 mm in diameter and just over 6mm in thickness, it easily slides under a cuff. Water-resistant only to 20 meters, it is clearly more at home in a boardroom than in rugged environments.

Unlike the original RD2 prototype, Audemars Piguet replaced the traditional Grande Tapisserie dial with a sunray gradient blue dial, a choice that significantly enhances the watch’s legibility. The perpetual calendar indications are displayed on black recessed subdials, providing contrast with the more colorful aventurine moonphase disc. The time is easy to read at a glance, thanks to the white gold hands and indexes, all coated with luminescent material.

Limited to just 200 pieces, this Royal Oak Perpetual Calendar Ultra-Thin in titanium stands among the most sought-after perpetual calendars on the market today. It perfectly illustrates what Audemars Piguet does best : blending the unmistakable Royal Oak design with advanced engineering, all in a form of quiet luxury that favours elegance over attention.