Pre-Basel 2017 – Geo. Graham Tourbillon Orrery Tourbillon
The case, in 18kt rose gold, measures 48mm x 17.6mm. It has an AR-coated domed sapphire crystal, a sapphire display back with 100-year scale. Moon and Mars correction indicators and serial number hand-engraved. 18kt rose gold right hand control crowns (planets’ crown at 2 o’clock which also enables to set the calendar, manual winding and time crown at 3 o’clock). Moon corrector at 4 o’clock. Mars corrector at 10 o’clock. It is water resistant to 50 meters.
Movement is the Swiss manual-wind caliber G1800 created exclusively for Graham by Manufacture Christophe Claret, with 35 jewels, 21,600 vph and a power reserve of 3 days. Functions are: hours and minutes. Tourbillon, mechanical solar system model with 100 years calendar (two additional graduations of 100 years 300 years in total). Year counter on the caseback with planet correction indicators. (Moon: 7 years, Earth: 1156 years, Mars: 25 years).