Originally Posted by Hudson308

That dropout extension is characteristic of frames made by the Cleveland Welding Company. They made frames for Murray, Sears, Western Auto and others.
Sometimes they were used to support fenders, racks and banana seat struts, but mostly it was a trademark design flourish.

Originally Posted by Hudson308

Thanks! Sears Spaceliner from about '65.
I've got the original tank and light assembly, removed and stored separately to avoid (more) damage.
A detail shot of the horn & light controls...