No metal normally used for coinage in ancient or mediaeval times would corrode all the way through like that. I'm reasonably sure that whatever it is or was, it wasn't a coin.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
This is a coin 99% It was heavily affected by bronze disease. After the treatment in electrolysis bath the damaged parts were removed and the hole has formed.
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