Thank you enablers!!
I went back to the lgs for another look. The store owner said this gun was a consignment sale. The owner had loaned it to his brother, who left it in a camper shell where moisture got to it. So the damage is surface rust, made worse in spots by bubba’s attempts to remove the rust.
It is a Monson gun, serial number 14,081, which as best I can tell dates it around 1979. I bought it for $400 plus tax.
Pix show it as it came home from the lgs. Worst spots are behind the left side recoil shield. I will post more pix after cleaning and range testing.
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