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Maybe but I don't think its oval enough. The fixing or shank picture will sort it out, but clearly the OP has no real interest in finding out.Could it be a "Grotesque" for a flintlock?
Jefferson Patterson Park and Museum - State Museum of Archaeology
Hope this pic helps.. TinaView attachment 1554456
They (concaved) get to nearly 30mm in the 17th C & yes have a drilled shank. I can't tell the size but if its any bigger I think we can discount a button. The face would also be a first for me as most are just floral/punched dots etc..I would lean towards drilled shank, old button? Bramblefind may be on to something too, it is pretty big for a concave button? Leave it up to you and Tim to find something that stumps everyone!
OK, more button like, but what is the diameter?I just talked to the fellow that found it, he said you can see a radius of a hole right at the break, which doesn't show in the pic. He also said the shank is slightly tapered?