1949 Straight 8 Continental
Frogster, you beat me to the Avions Voisin but as a certain wag once wrote, "One man's meat is another man's poison, My favorite car is the Avions Voisin."--Ogden Nash
With Citroen D types, it is necessary that you grow to appreciate them but if you consider the number of current vehicles based upon the styling concepts, it is probably the most seminal design ever.