Audemars Piguet pre-owned Royal Oak perpetual calendar chronograph, model 20068604. Features a stainless steel case measuring 39mm in diameter with an octagonal bezel face and baton hands on its royal blue dial. Equipped with an automatic movement containing perpetual calendar functionality, moonphase indication, along with chronograph counters. Comes with screw-down crown, adjustable link bracelet folding clasp, original box, and CHRONEXT certificate included. Condition: good - minimal signs of use present. Authenticity guaranteed by inspection from certified watchmakers under the two-year warranty which covers movement repairs and water resistance fixes for damaged items.