I don't know about that car man, too many questions. a.) That plastic looks too clear to me, I would think it would be yellowed more by now just with time. There are very nice reproduction available now and it would't take too much effort to run a few off in clear plastic. b.) If it was a 'salesman sample' I would think it would be from the first run, with gray bumpers and the men in reverse colors. c.) I looked closely, and the men do not look like originals. The figures are too rounded and the paint on the face looks too good, exactly like the reproductions now available.
d.) I have never read or heard of a clear shell #50 in any collector book.
I hope the car came with strong province.