The coin was minted in Antioch, which had at that time been renamed "Theopolis". The mintmark is "ThUPO" in Greek letters, a one-year-type issued only in the 13th year (ANNO XIII) of the reign of Justinian I (AD 539-540). You can see a similar coin about a quarter of the way down on this page.
As to how a Byzantine coin might have gotten half-buried in an American backyard, one can but guess. It might have been part of a stolen coin collection; when the thieves found out the coins were not spendable, they simply dumped them. Or someone might have thought it was fake, and thrown it away in disgust.
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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