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A 122-year Perpetual Retrograde Moon Phase from Graham

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October 2012


The Geo.Graham The Moon model combines a flying tourbillon with a high-precision retrograde moon-phase perpetual function, whose cycle is calculated based on the Moon’s exact synodic period (29 days, 12 hours, 44 minutes and 2.9 seconds to be precise) for a duration of 122 years. At the end of each synodic period, the retrograde mechanism ensures that the Moon jumps back to the beginning of a new moon-phase cycle, while a double absorber system developed for Graham by Christophe Claret in Le Locle ensures that the 0.07 gramme hand-painted moon is not damaged by the retrograde mechanism. The moon phase display only needs correcting once every 122 years, by a simple push on a corrector.

Geo.Graham The Moon by Graham
Geo.Graham The Moon by Graham

The G1769 tourbillon movement is coated in blue and adorned with constellations of 45 diamonds (0.24 cts) (flange collar: 11 diamonds, dial: 34 diamonds) such as Camelopardalis, Perseus, Cassiopeia, Ursa Major, Ursa Minor, with the centre of the dial being the North Star’s relative position. It operates at 21,600 vibrations per hour and offers a power reserve of 96 hours.

The G1769 tourbillon movement
The G1769 tourbillon movement

The sky colour theme continues on the painted sapphire bezel, which features the Milky Way galaxy and contrasts with the 18-carat pink gold case. A sapphire stone on the crown at 3 o’clock provides the perfect finishing touch to this celestial colour scheme. A matching blue crocodile leather strap completes the ensemble. The Geo.Graham The Moon model is a limited edition of only 20 pieces.

Source: Graham