The Ultrathin Tourbillon collection feature a 41.5 mm case that is just 8.3 mm thick beneath it domed sapphire crystals. The offset display and the tourbillon aperture echo the way in which information was arranged on John Arnold’s marine chronometers.
At the heart of an Ultrathin Tourbillon lies the A&S8300 calibre, whose architecture and finesse characterise the collection. At just 2.97 mm thick, this tourbillon with extremely refined finishes is one of the slimmest ever designed. The redesigned tourbillon carriage echoes the leading role John Arnold played in marine exploration during the 18th century. Its triangular shape evokes a sextant, while its double-arrow counterpoise represents an anchor. Finally, the back of the Ultrathin Tourbillon reveals a hand-engraved rear tourbillon bridge in 3N yellow gold that matches the gear train and stands out from the appearance of the rest of the calibre.