The great success that Porsche enjoyed with its first 550 Spyders spurred its small but effective racing cadre to a more ambitious design with its Type 550A. A stiffer space frame was inside the 550A that Umberto Maglioli drove single-handed to win the 1956 Targa Florio - hailed at the time as ''Porsche's greatest victory''.. See them all depicted in magnificent images from the Ludvigsen Library.

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