10x8 inches (25.4cm x 20.3cm approx)
Here for the Healey 100/4 with the wild paintwork, and what appears to be a Devin (Emily) that Pat Boone (white racesuit) drove in this musical, which was a re-hash of the 1945 original.
IMCDb will tell you that the Boone car is a Victress, but the guys who know Victress fiercely dispute this.
Lyricists were obviously in short supply at the time. Consider this stirring line from the title track of the movie: "Our state fair is a great state fair, it's the best state fair in our state."