The Audemars Piguet Royal Oak Perpetual Calendar (Ref. 26579CS.OO.1225CS.01) is a striking timepiece that showcases the brand's dedication to innovation and craftsmanship. This 41mm watch features a case and bracelet entirely crafted from blue ceramic, complemented by a matching blue Grande Tapisserie dial and subdials, evoking the serene expanse of a starlit sky. The dial is adorned with blue counters, white gold applied hour-markers, and Royal Oak hands with luminescent coating, all encased under a glareproofed sapphire crystal. Powered by the selfwinding Caliber 5134 movement, it offers a 40-hour power reserve and includes functions such as a perpetual calendar with week indication, day, date, astronomical moon, month, leap year, hours, and minutes. The watch is water-resistant up to 20 meters and comes with a blue ceramic bracelet featuring an AP folding clasp in blackened polished steel.