Arnold & Son pushes precision chronometry ever further with the Constant Force Tourbillon, featuring a patented constant force device with 60-second tourbillon and true beat seconds. The symmetrical movement architecture of the Constant Force Tourbillon movement pays tribute to Arnold & Sons’ historic marine chronometers. At the top, two visible mainspring barrels and the constant force device provide optimal power to the tourbillon at the bottom of the dial.



Hours, minutes, small seconds
Exclusive Arnold & Son mechanical movement, hand-wound, 39 jewels, diameter 36.8 mm, thickness 6 mm, power reserve 90h, double barrel, 21,600 vibrations/h
Movement Decoration
Nickel-silver and steel movement, palladium treated bridges and NAC grey treated main plate with Haute Horlogerie finishing: hand-chamfered bridges with polished edges and brushed surfaces, screwed gold chatons, screws with bevelled and mirror-polished head.
Tourbillon cage
Mirror-polished with hand-chamfered polished edges and circular satin-finished surfaces.
18-carat red gold case, diameter 46 mm, cambered sapphire with anti-reflective coating on both sides, see-through sapphire case back
Anthracite open dial
Hand-stitched brown bottier alligator leather with patina
Water Resistance
30 meters