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The base caliber of the Chronomètre d'Observatoire (observatory wristwatch) is the famed Peseux 260, a movement mostly used for observatory trials. It has been hand finished with Geneva Stripes, anglage and perlage. Special attention has been given to the free sprung 13mm diameter balance wheel. While the exterior of the spring uses a typical Breguet overcoil, the spring has been given an inner terminal curve devised by Moritz Grossman one of the original founders of the Deutsche Uhrmacherschule in Glashütte. Grosmann, who later taught at the Horological School at Le Locle, was influential in the science of chronometry and in the final development of the precision watch in the early 20th century.
Kari Voutilainen was born in Finland in 1962. He moved to Switzerland in 1989 to attend the International Watchmaking School where he completed the WOSTEP complicated watch course, a post graduate course for those watchmakers dedicated to the restoration of complicated, high quality rare watches. Following his graduation he found work as a restorer for Parmigiani. In 2002, Voutilainen established his own company in Môtier Switzerland.