Not the typical bobbed off wagon (wagon would be a better choice, gives you a tailgate), but still a 4-door sedan.
To do one of these right and look factory and not a hatchet job is to have the lager doors from a 2-door and the lower roof of a hardtop.
One of these days I'd love to build one on the Coronet platform, the most likely platform had Chrysler actually built one.
Here's a better view, looks like it says Weiand on it.
The style is BB mopar-familiar, but some Nash, Studebaker and Hudson V8s had the bridge-style like ours, I think maybe some Caddy, Olds, Buick did also.