I can assure you it's an old coin, becuase I found it buried about 50cm deep when we renovated our backyard (about 5 years ago). Anyone knows what are the letters on the coin ?
Whether it is "old" or not is, sadly, irrelevant, because this is not a genuine coin. The design is that of a mediaeval gold coin of Hungary, a goldgulden of king Matthias Corvinus, circa 1483. You can see an example with this design on this CoinArchives page. (Note that free-to-access CoinArchives pages only last six months and this one dates from October 2012; it will become obsolete soon). They did not make copper coins at all and did not use this design on anything except gold coins.
I suspect what you may have here is a piece of copper which a (modern) counterfeiter used to test his fake coin dies, before he started making counterfeit coins out of actual gold. The counterfeiter then buried his "test pieces" to try to hide the evidence of his crimes.
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
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