The oldest fine watchmaking manufacturer, Audemars Piguet marks another technological milestone with the new Royal Oak Selfwinding Perpetual Calendar Ultra-Thin (ref. 26586IP.OO.1240IP.01). The new Royal Oak becomes the world’s thinnest automatic perpetual calendar wristwatch by integrating three levels of its perpetual calendar functions into one single layer.
There are two pioneering and patented innovations: the end-of-the-month cam has been integrated to the date wheel, while the month cam has been combined to the month wheel. The geometry of each component has also been optimised from the onset, reducing adjustment and assembly time. The dial, too, has been redesigned compared to previous Royal Oak Perpetual Calendar models (such as ref. 26574). The day, date and month sub dials have been enlarged for optimum legibility, while the night and day indication at 8 o’clock has been added symmetrically to the leap year indication positioned at 4 o’clock.
Evolving from the initial 950 platinum RD#2 prototype presented in 2018 at the SIHH, the Royal Oak Selfwinding Perpetual Calendar Ultra-Thin combines titanium and 950 platinum for an elegant look and a significant lighter feel on the wrist. As for the movement, the case, bracelet and dial have been finished by the expert hands of Audemars Piguet’s craftsmen. The alternation of polished and satin-brushed surfaces adorning the case, bracelet and bezel elevates the aesthetic contrast provided by the two materials. In addition, the dial of the Royal Oak Selfwinding Perpetual Calendar Ultra-Thin is no longer endowed with a blue “Grande Tapisserie” pattern. Instead, its blue satin finishing enhances legibility as well as the watch’s refined aesthetics.
Royal Oak Self-Winding Perpetual Calendar Ultra-Thin // 41mm Specifications
Perpetual calendar with day, date, astronomical moon, month, leap year, night and day indication, hours, and minutes.
Satin-brushed titanium case, glareproofed sapphire crystal and caseback, polished 950 platinum bezel and links, titanium screw-locked crown, water-resistant to 20 m.
Blue satin-brushed dial, blue counters, white gold applied hour-markers and Royal Oak hands with luminescent coating.
Satin-brushed titanium bracelet with polished 950 platinum links and titanium AP folding clasp.
Self-winding Manufacture Calibre 5133
Total diameter 32 mm (141⁄4 lignes)
Total thickness 2.89 mm
Number of parts 256
Number of jewels 37
Power reserve 40h
Frequency of balance wheel 2.75Hz