Was out with my DFX the other day. Found this 1868 20 Kreuzer Franz Josepf at 7 inches and the other two were in the same spot a few inches deeper. How to clean each one of these. 20 Kreuzer is in quite ood shape but the other two are in poor shape, I think they are ever a bit older. Please help. Don't want to do anything wrong.
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