Audemars Piguet Perpetual Calendar "150ᵀᴴ Anniversary"

The Audemars Piguet Royal Oak Perpetual Calendar "150ᵀᴴ Anniversary", reference 26585XT.OO.1220XT.01, has the octagonal case with integrated bracelet in titanium, measuring 41mm in diameter and 9.9mm thick. The openworked dial is skeletonized with blue subdial rings and is protected by a glareproofed sapphire crystal. It is powered by the selfwinding calibre 5135, offering 40 hours of power reserve and combining a perpetual calendar with moon phases and hours and minutes display. The watch is water resistant to 20 metres.