Arnold & Son True Moon

The True Moon watch by Arnold & Son provides a realistic representation of our grand cosmic clock, already expressed through other creations including the groundbreaking True North presented in 2004. Like its predecessors, this stunning new model is entirely keeping with the Arnold & Son spirit of discovery, which originated in the 18th century quest for longitude and has since extended beyond maritime horizons to encompass exploration and navigation on land and even in the air.

Arnold and Son True Moon watch rose gold version

The next step was of course space, a vast territory that Arnold & Son had already begun to chart with the creation of innovative perpetual calendar and equation of time mechanisms. While the latter revolved around enabling a correct calculation of true solar noon, the True Moon is powered by a world-first mechanism capable of keeping precise track of the true waxing and waning faces of the nocturnal heavenly body.

Arnold and Son True Moon watch with rose gold case and blue dial

To achieve this unprecedented feat, it is calculated on the exact synodal period corresponding to 29 days, 12 hours and 44 minutes.

Arnold and Son True Moon watch stainless steel version

Technical details

Model: Arnold & Son True Moon

18-carat rose gold or stainless steel, diameter 46 mm, cambered sapphire with anti-reflective coating on both sides, case back metallic sapphire, water-resistant to 50 m
Crown at 3 o’clock
Water resistance: 160 feet (50 Meters

Automatic movement, calibre A1788
Exclusive Arnold & Son mechanical movement, self-winding, 21 jewels, diameter 38.6 mm, thickness 7.47 mm, power reserve 42 h, 28’800  vibrations/h
Movement decoration: rhodium treated with fine circular graining and ‘Côtes de Genève’

Hours, minutes, centre seconds, perpetual moon phase at 6 o’clock, date display at 3 o’clock

Blue base with wavy guilloché motif
Midnight blue central zone with transferred yellow stars and set with 19 diamonds starts

Black alligator strap 

1TMAP.U05A.C42B: 18-carat rose gold case
1TMAS.U03A.C42B: Stainless steel case

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