Sorry, I done passed out in amazement. I figured my hint would be all but worthless but once again, the knowledge contained here leaves me breathless.
It is indeed a 1948 Lambert CS. Germaine Lambert created a number of interesting automobiles, if not in quantity then in variety. Among them, the CS coupe, as pictured, in addition to:
1949 Spyder Grand Sport

1931 Type TA (kind of a Paris Hillbilly rig, if you asked me)

Cabriolet Tudor

1950 1100 Racer

Excellent work AllanL! That one was not for the faint of heart. As an added bonus, I got to sneak in a Georges Irat reference too! Woohoo!