This is a beautiful one-off car. The car in the color photo is the same in the b&w, but the front air intakes are different. I saw them in another picture. Probably they was modified in 1959, following the new rules of the road, forcing to install the front direction indicator and to remove the side direction indicator levers.
I have no doubt the designer is Mario Revelli di Beaumont (1907-1985). He worked for Farina, Fiat carrozzerie speciali, Pininfarina, Bertone, Ghia, Siata, General Motors, Simca, and others. After the 1967 he worked in education, advising the School of Art and Design in Turin, and the Art Center College of Design in Pasadena.
The Alfa 915516 is a natural evolution of this 1941 Fiat 6C 1500 coupè, Revelli designed for Bertone.
The vehicle is exhibited at the National Car Museum of Turin.