The flyback function, also known as the “retour en vol”, enables the hands to be zeroed and restarted instantly, without having first to stop the hand and return it to zero. The function had its origins in the 1930s in the military area, in particular in the field of aeronautics, where pilots wearing such a chronograph found that it significantly simplified their operations.
In 2013 Officine Panerai presented the first automatic chronograph movement with flyback function developed in-house: the P.9100. Characterised by its column wheel and vertical clutch, the P.9100 calibre has a power reserve of three days, central chronograph minute and seconds hands, calendar and seconds reset. The push-piece which operates the flyback function, returning all the hands to zero when the chronograph has been stopped, is at 8 o’clock.