The tourbillon movement has always been a hallmark of elegance in the world of luxury watches, and it holds a special place in Arnold & Son's history. John Arnold, a renowned watchmaker, had a close relationship with A.-L. Breguet, leading to one of the most remarkable partnerships in the world of horology. This collaboration is evident in the first ever tourbillon mounted in John Arnold's No. 11 movement, which can be seen today in London's British Museum. The current version of this exceptional timepiece boasts a white gold case and a black ruthenium / NAC-treated caliber 8000.