Do they still make Naval Jelly?Hose it down with WD-40. I bet it can be made to shoot again. I love little projects like that. I have several old junkers I’ve rescued like that. I Probably couldn’t get $50 for most of them.
The screw choke makes me think mossberg. But the Western Auto Revelation comment stands out.
WD-40 and 000 steel wool will help you figure it out.