Audemars Piguet Royal Oak Perpetual Calendar in its limited edition form, model number 26584OR.OO.1220OR.01. Crafted from an 18K rose gold case measuring 41 mm in diameter and featuring a deep blue Grande Tapisserie dial. Equipped with a full perpetual calendar complication providing automatic date calculation including month length and leap years. This is a pre-owned, limited edition item representing a rare fusion of heritage design, complex mechanical innovation, and luxury craftsmanship.