The design of this watch with its single-button chronograph and oblique registers is probably unique in Breguet production. Accor-ding to the Breguet certificate the present watch No. 343 was manufactured on June 15 1948 and sold to "La Maison Burma" on January 31 1952. The off-center placement of the single push button of the chrono-graph allows the instument to be used in the easiest manner. This model was produced in one example only. This was a prototype: the watch was never produced in series.