The Girard Perregaux 40.0 watch movement is an open face calibre timepiece featuring a pin-lever escapement. It incorporates a ratchet on the dial side and a hidden crown mechanism with a rocker bar. The movement offers functions such as stem winding and setting, as well as a sub-second display. Its production period roughly encompasses the year 1950.
The Girard Perregaux 40.0 features the following functions: