Franco Scaglione, Alfa Romeo (B.A.T.) 5, 7 & 9 concept cars, 1953–1955. Via Sotheby’s

Ahead of their time on the aerodynamic front, the outrageous styling also made a splash on the auto show circuit. But underneath the skin, all were relatively traditional Alfa Romeos. Bertone used the platform of the 1900 small sport sedan, putting the emphasis on the sheetmetal—not the performance. Even so, the 5 and 7 were both capable of speeds well over 100 mph.

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