You can tell a coupe from the two door sedan by the rear side Windows . The coupe is a lot smaller. This one is for sure a two door sedan Rear windows way two big for a coupe.
Funny I had both 53 Chevy coupe and a Belair two door sedan. Your right about the coupe no window cranks And no back seat. Dam if I can remember how far the back windows rolled down on the two door sedan.