It's early Byzantine. Emperor Justin II and Empress Sophia, I believe, in which case "ANNO XII" (Year 12) correlates to AD 575/576. "TES" is the mintmark for Thessalonica. For a couple of similar coins, see this Wildwinds page; scroll down to the ones numbered "366".
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
Thank you! Now to give coin a nice bath so the grungy stuff come off (yes I've read through the cleaning section ), My daughter is ecstatic with the news.
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