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On this exceptional model, the tourbillon appears in a complex “armillary“ version. This term is a nod to the work of 18th century French watchmaker Antide Janvier who invented a moving sphere with a planetary gear known as an armillary. Visually, this tourbillon evokes the interlocking circles and armillas graduated metal discs) of the famous scientific instrument modelling the celestial sphere. The construction of this type of regulator – designed to compensate for the effects of gravity on the smooth running of the movement – consists of two nested carriages rotating around two different axes at a speed of 60 seconds per rotation to form a sphere in perpetual motion. Given the watch’s vertical position on the car dashboard, the presence of such a regulator at the heart of the mechanism is fully justified. The tourbillon was developed at the beginning of the 19th century precisely to remedy the isochronism problems affecting the balance-spring of pocket watches, which were also generally vertically housed in a fob.
