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By Lauren Hill | September 6 2017
From Graham, the manual Geo.Graham Orrery Tourbillon houses the Caliber G1800, a high-precision mechanical movement exclusively made for Graham by Christophe Claret. The 48mm watch with blue lacquered dial offers a 100-year calendar on the caseback, with two additional graduations of 100 years for 300 years of total calendar accuracy. The dial offers hours and minutes, Gregorian calendar (365.25 days) and zodiac calendar. The solar system is represented by different materials: moon by a fragment from the NWA4881 meteorite; Earth by Kingman Turquoise; and Mars by a fragment from Tissint meteorite. The sun is represented by a hand-engraved tourbillon bridge with two phoenix heads inspired by a George Graham decoration, with a close-set diamond at the center. Just eight pieces are being made.