Who may have built the car: Giorgio Giordanengo
When it may have been built: In the '90s.
And, while we have the word of a Bizzarrini expert that the car is only tenuously connected with Giotto Bizzarrini, it seems to be his brainchild, whether he authorized or commissioned its construction or not. It follows a line he himself created, and so it might be described as a "continuation car" or perhaps a "tribute car".
For a time, it was an accepted fact that three Bizzarrini Spyders had been built. Then a fourth, powered not by a Chevrolet engine but by the Bizzarrini-designed Lamborghini V8, came to light, when such a car seemed an utter chimaera.
Then another Lambo-engined car was revealed. And this ridiculously brief and wildly unofficial history brings us in a roundabout way to the puzzle car and its possible origin.
In 1969, Richard Teague commissioned Bizzarrini to create a series of prototypes for American Motors Corporation's AMX-3 program. Despite much promising feedback, AMC ended the program, and for tax reasons ordered Bizzarrini to destroy the six beautifully handbuilt cars and to scrap the full parts inventory.
It has been suggested that not only were the AMX-3 cars not destroyed, but that in fact more than six AMX-3 cars exist today. Some believe that a cache of unscrapped AMX-3 parts and an abundance of craftsmanship have made this burgeoning supply of rarities possible. There are hints that chassis numbers can be subject to the same sort of ambiguity as the construction dates.