2017 pre-owned Royal Oak Perpetual Calendar C 41mm from Audemars Piguet featuring black, stainless steel, octagonal face, baton dial, baton hands, perpetual calendar, moonphase indication, screw-down crown, adjustable link bracelet, concealed clasp fastening, automatic movement, circa 2017, 41mm and pre-owned. Original papers and CHRONEXT certificate included.. An inspection by the CHRONEXT-certified watchmakers guarantees authenticity.. All repairs of the movement of the watch and the repairs of water-resistant watches with water damage are covered by the CHRONEXT two-year warranty..