Roger Gerbout, RG Speciale with Lombard engine. Comes from cca 1949. At least the picture is seemingly from a 1949 Coupe d'Argent.
P.S. or maybe not that venue, because I've found the source listing the RG Speciale which took part in that race as having BMW power, while before and after there were RG Speciale (and Gerbout Speciale) entered with Lombard unit. Maybe two of them at the same time, for both Robert and Roger Gerbout?