Gérald Genta, OCTO Perpetual Calendar, Model: OQM.Y.60. The entire watch is made of 18K white gold. The octagonal case with an inner circle and an outer square is designed by Master Genta. The crown is set with ceramics. The gold base is hand-painted enamel dial. Since the enamel must be hand-burned, each piece is unique. The perpetual calendar moon phase with leap year function, Taiji Bagua type dial. According to Taoism, Taiji Bagua means having great supernatural powers! German silver automatic movement (the same material as Lange's movement), white gold large folding clasp, very rare, diameter 42.5x42.5mm.