The Alfa Romeo 6C 2500 SS Spider was a legendary car that was much ahead of its time in the late 1940s. The number 6C denoted the six cylinders, while 2500 denoted the 2500 cc engine under the hood, and the letters SS stood for Super Sport. 

Designed by a Hungarian immigrant, Vittorio Jano, who worked for Alfa Romeo, this car had several hi-tech features—triple carburettors, DOHC (Double OverHead Cam), hemispherical combustion chambers, streamlined fenders, etc. Built during the years 1927-1954, nearly 700 of these were produced that could go to a top speed of 150 km/h. 

The new post-war Alfa Romeo 6C 2500s were nicknamed "golden arrows" or "Freccia d'Oro" in Italian and were supplied to reputed coachbuilding houses such as Boneschi, Touring, etc. About six of these Alfa Romeo 6C 2500 Sport Freccia d'Oro models were built as convertibles (Spyders, in Italian). However, what remains a mystery is that all these six were RHD (right-hand-drive) built.