I'm supposed to be meeting Jean Graton, Michel Valliant's creator, at a party tomorrow night.
I'll try and get some info from him then.
Incidentally, Michel Valliant was a TV series in the mid 60s, with MV played by real-life racer Henry Grandsire, and with genuine GP footage with the GP drivers of the day.
Henry was once French F3 Champion and came a heroic 9th overall in a 1292cc Alpine A210 with Leo Cella at Le Mans 1966. 1st in Prototypes 1151-1300cc.