The blackened ones shown look like similiar coloured badges that have turned thta colour because they have been buried for a period of time. The bimetals can be seen wear cleaning has removed the discolouration from the highpoints but the staining remains below. As you say 'heavily coroded brownish'. I would avoid paying a premium for such an item without further proof that such a thing existed.
These should not be confused with Officers bronzed badges.
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