For me its the Mercedes 300sl, iconic car and was a first in so many levels and arguably the worlds first proper supercar.
plus what really seals the deal for me is the related 1950s MB transporter for the car, it was the only racing team who brought their cars straight form the factory to the racetrack and went back on the autobhan at a 100mph to the factory to get tweaked and fixed and back the roace track at 100mph before the next race and this allowed them much success. I just love the idea, it had the same engine as a 300sl and is just so odd looking with the tires so much behind the cab. also had height adjustable suspension when it came to unloading time I think. It was designed to be aerodynamic and all this in the 1950s! best of both worlds.

