Arnold & Son caliber A&S8305
Exclusive Arnold & Son mechanical movement, self-winding, ceramic ball bearing, 30 jewels, diameter 35.00 mm, thickness 8.15 mm, power reserve 55 h, 28,800 vibrations/h. Movement decoration: palladium treated with Haute Horlogerie finishing: hand-chamfered bridges with polished edges, fine circular graining and Côtes de Genève rayonnantes, all chronograph levers are satin-finished with hand-chamfered and polished edges, circular satin-finished wheels, blued screws with bevelled and mirror-polished heads. Hand-engraved 22-carat red gold skeletonised rotor with brushed surfaces and chamfered polished edges. Tourbillon: 18-carat red gold tourbillion-barrette, satin-finished with hand-chamfered and polished edges, tourbillon cage hand-chamfered and mirror-polished bridge.