Gerald Genta: A two-coloured gold perpetual calendar wristwatch in stepped two-colour octagonal case with hinged bar lugs, the matt silvered dial with raised luminous five-minute marks, subsidiary dials for day, month and date, blue disc with apertures for the moon, the water resistant screwed back signed by the maker and further inscribed Aconcagua 1982, perpetuel G2599 4 24230 with two-colour gold bar link bracelet and deployant clasp