Audemars Piguet Royal Oak Perpetual Calendar in stainless steel, Ref# 26574ST.OO.1220ST.02. On a stainless steel bracelet with a concealed double push-button double deployant clasp. Rounded octagonal stainless steel bezel with a sapphire crystal. Sapphire display caseback. The case diameter is 41.5mm. Self-winding movement with day, date, month, week indicator, and moon phase. Blue Tapisserie dial with applied luminescent stick hour markers and luminescent filled hands. With winding box, booklets, and papers.