To the best of my knowledge, the only two French registered Princes, F-BJAI and G-BJAJ, operated from Paris-le Bourget whilst with SAPA (although most of their time they were either away globetrotting and/or registered in other countries - see
ADASTRA AERIAL SURVEYS - VH-AGF), which is a long way from Lyon. Thus I suspect that it is not one of these in the background of the photograph of F-PJCV (furthermore the tail markings don't tally). However I haven't had the time to go through my books to see if there were any French post-war light transport aeroplanes with tails similar to the Prince.