Audemars Piguet Royal Oak Perpetual Calendar 26574ST

About This Watch

The Audemars Piguet Royal Oak Perpetual Calendar 26574ST is one of the thinnest perpetual calendar sports watches in the world at just 9.5mm thick. The caliber 5134 manages to integrate a full perpetual calendar mechanism, including moon phase, day, date, month, leap year indicator, and even an astronomical moon cycle, into a movement thin enough to maintain the Royal Oak's characteristic slim profile. The blue "Grande Tapisserie" dial is organized with remarkable clarity: day and month in apertures at 12 o'clock, date via a pointer hand on a sub-dial at 3 o'clock, moon phase at 6 o'clock, and leap year indicator at 9 o'clock. The week number is displayed on the outer ring of the date sub-dial, an unusual but useful complication for those in business environments where ISO week numbering is standard. Despite the mechanical complexity, all calendar functions can be advanced forward using four corrector pushers concealed in the case band. The stainless steel perpetual calendar Royal Oak represents extraordinary value compared to its gold and platinum siblings, offering the same complication and movement in a more accessible material. It has become one of the most coveted complicated sports watches in the world.