I do not have the badge with me to clean it up at the moment, all these badges have been sitting in a bag of unknowns for a few years now. This was a random example of a photo I took earlier. However I do not think it was ever silvered, I too think it was blackened brass, I have other examples both blackened and silvered and even enameled (if they are indeed boss badges) but I will have to wait until I return home to be able to post a picture of them.
Jim
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