What - ever it is, it is not "desirable".
And as said before, it is a "euphemism" for "rust"- which itself is a type of "corrosion".
Even if not "exactly" rust- it is still an imperfection from another cause.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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