I came across this thread when searching for the toy car that some original mold patterns produced that I came across in an antique store years ago.
After MUCH searching and asking questions anywhere I could find, finally with the help of the internet world the question has been solved! Have a look at the original mold patterns, amazing amount of work and skill making those molds.
These molds made the PMC 1952 Chevy two door coupe promo bank!
I now believe that this car below was indeed made in the molds I have. To my eye, every detail seems to match. Right down the to lower three faint horizontal lines on the rear fender under the main offset line. Hood and trunk emblem are perfect match, as are the door handles.
The round injection holes match perfectly on the bottom, and notice the interior fender swells from the bottom. The front is rather round, but the rear is swept back quite a bit. The openings for the axle, and the surface steps toward the ends. Same as the mold:
The front/rear bumper were separate pieces were added later: