1949 and 1950 Chevies were very similar, but the 49-version had vertical bars in the lower part of the grille and the 1950's didn't. Fleetline was the name for the fastback, Styleline for the notchback. Special was the basic version, DeLuxe the more luxurious one. So I'd say this is a 1950 Chevrolet Styleline Special Sportcoupe [GJ1524].