Arca - 1931
Produced in 1931 and used to power the Arca clock, this patented skeleton movement with a 30-day power reserve features a constant force escapement. Patent no. 142508 was registered in 1929 by the renowned watchmaker Philippe René Jaccard, famous for his work on chronometers and constant force calibers. That same year, Vacheron Constantin won the Concours de la Rive competition organized by the Société des Arts. The aim of this prize was to reward the use of an R. Jaccard constant force system in a pocket watch. A very similar model (Reference number 3354) was then presented at the Swiss National Exhibition in Zürich in 1939.
