Jean Lassale was a Swiss watch company that designed the Calibre 1200, featuring the thinnest mechanical watch movement : 1.2 mm. In the 1970s, Pierre Mathys, master watchmaker in La Chaux-de-Fonds, designed and built the prototype of a revolutionary watch caliber, with the goal of making the thinnest watch in the world.To achieve this feat, Mathys based his design on the work of Robert Annen ...