This coin was not "encrusted", as much as having a strange brownish patina, which made me wonder about its authenticity. Found as part of a spill of four coins: two King George Halfpennies and a smaller copper coin I have been unable to identify.
@cos, first welcome to CCF. Second, with regard to the coin-shaped object that you can't positively identify, feel free to post it on CCF and perhaps we can help you get an attribution. Here is the right subforum for you to create that new thread:
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