The one-off design was based on the Fiat 1400 with a motor souped-up Abarth-style to the 1500 cc category. The body style is coupé, so the term biposto, meaning two-seater, is somewhat redundant.
The Biposto is seen by a number of observers as a precursor of Scaglione's 1953 Alfa Romeo Berlinetta Aerodinamica Tecnica B.A.T. 5. Given their timing, I can see how Scaglione's thinking might progress from one concept to another. However, the three B.A.T. designs were exercises in attaining extreme aerodynamic efficiency, whereas the Biposto is something of a mixed bag in that regard.
Very strong frontal stying featuring a Tucker-like central headlight. There are no bumpers to dilute the theme.
The general body shape suggests attention was paid to aerodynamic considerations, though I haven't seen any references to it having been tested in a wind tunnel (but it might have been). Those prominent scoops in the wheel opening ensembles strike me as being aerodynamically draggy, causes of turbulence.
The back window is boat-tailed, making the greenhouse teardrop-shaped in plan view -- another aerodynamic hint. Note the small, curved tail fins: the B.A.T. cars have much more elaborate versions of these. There are small, barely functional rear bumpers.
Head-on view of the aggressive front. There is no lower air dam, but the B.A.T. cars also lacked them, and they were highly efficient.
A general view of the Biposto. It has a panoramic windshield, but no dog-leg forward door cut-line such as were found in mid-1950s American cars with wraparound windshields.
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