Porsche 917. This is a very famous car, used in the filming of the 1970 movie "Le Mans". That was also the same year that Porsche won Le Mans for the first time with the iconic 917. Note the mirror positioned in the center of the roof.
Check out the videos of this car's restoration at Gunnar Racing on YouTube - http://www.youtube.com/watch?v=zaUHZQoG2BY