Audemars Piguet, Royal Oak Quantième Perpétuel Ultra-plat Automatique

To reach an ultra-thin movement of 2.89 mm in height, the perpetual calendar functions, normally arranged on three levels have been merged into one single layer. This led to the development of 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 subdials 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.