No, this isn't the real-life car of George Jetson. It's the 1960 Pininfarina X, a futuristic concept from the famous Italian design house for a four-door saloon with three wheels and an aerodynamically shaped body that was said to achieve a drag coefficient of 0,23. Pininfarina's concept model features a 43HP Fiat engine of the same era.
Thanks for the tip Henry! Link: Atscollection