There is an impressive piece on show at Graham: the Geo.Graham The Moon. A flying tourbillon shares room on the blue dial with an enormous high-precision, hand-pained retrograde moon phase. In theory, the display only needs adjusting every 122 years (by simply pressing a corrector) and respects the synodic period, which corresponds to 29 days, 12 hours, 44 minutes and 2.9 seconds precisely, if not to the second then to the nearest minute. Pushing the celestial metaphor further, Graham has dotted the dial with 45 diamonds to represent the main constellations spread around the epicentre of the watch, the pivot for the hands, which represents the position of the North star, the brightest polar star in the Ursa Minor constellation.

GEO.GRAHAM THE MOON by Graham

The piece is finished off by a painted sapphire bezel that depicts the Milky Way as seen through a telescope. George Graham regularly observed the moon at the start of the 18th century (from Fleet Street, which would be impossible today) and would no doubt appreciate this tribute. And it is a rare (20 pieces) and costly (CHF 240,000) tribute.