Any ideas what this plaque would have been used for? The reverse suggests it once had a bolt at the center, and looks as if it may have been attached to a wall. It is 5mm thick x 103mm wide (squared), and has a good amount of weight to it. The base metal appears to be solid copper (it is NOT magnetic). Any help identifying what exactly this is, and in what manner it would have been displayed, would be appreciated.
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