It doesn't look like the SEFAC to me. The SEFAC later became the Dommartin which never raced.Did you try to search that one?
1947-'48: Part two of the disastrous pre-war French SEFAC project, which was created as a rival to the all-conquering Mercedes and Auto Union, except that the SEFAC conquered nothing but ridicule. The SEFAC ran once, at Pau in 1939, and resurfaced in 1947, when an engine company called Dommartin started rebuilding it. The company gave it a new body, bored the engine out to 3.6 litres and removed the supercharger. Then the money ran out and the car never ran.