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Oxidation of the steel of a gun barrel.
Gun show, Shotgun News, gun shop, want ads.
No
A rifle.
Normally, steel.
I have the same gun, I belive it was either made by the Spencer Rifle co or Crescent Arms
Probably H&A
Steel
Blue Book of Gun Values will help.
Steel or Damascus barrels?
Blue Book of Gun Values, old gun catalogs