Jaguar E-Type Lightweight, launched in 1963 as a race version, designed by Samir Klat, only 12 where ever produced.
This is the 2014 clone of the original model, one of six, initiated by the Special Vehicle Operations of Jaguar/Land Rover, presented at Pebble Beach. Source. Photos: Rainer Schlegelmilch, one of the best german motorsports photographer.
Audi Quattro Spyder, concept car, 1991. It was the first Audi with an aluminium body. Only 2 were built, this one can be seen in the museum mobile of Audi in Ingolstadt, Germany. Source