Audemars Piguet Royal Oak Quantième Perpetuel Ref. 25829ST, automatic movement Cal. 2120/2802_SQ 38 jewels, stainless steel case 39mm, skeleton dial with subsidiary dials for the days of the month, of the week, the months, leap year and the age of the moon. Octagonal bezel set with 8 hexagonal nuts embanked in 8 screws on the case back, transparent case back, sapphire crystals. Audemars Piguet bracelet and deployant. Extrait de Registre. Produced in 2010.