^^ A lot happened in the hot rod aftermarket world between the 60’s and 80’s. I also am thinking somebody put an older windshield in a newer gl*** body. But we might never know if the OP doesn’t come back.
It wouldn’t surprise me if Ford Duplicators made a few coupe bodies way back then, decided that they didn’t sell as well as roadsters and were harder to build so they didn’t pursue it any further.
Darryl of Zipper Motors fame might be the culprit. He and a partner were making a 3 window in Idaho or Utah in the late 1970's when I first met him. The only defining feature I can think of is they used a fabricated (welded steel) door hinge that was close to original. That closed up and he worked for Magoo's in Canoga Park, then ended with Zipper Motors in Grand Junction.
The Jalopy Journal
