Byzantine it is indeed. I can read DN MAUR to the left of the portrait, so it's emperor Maurice Tiberius (582-602 AD), but it doesn't have the "normal" Byzantine reverse of the large denomination-letter. This peculiar style seems to be restricted to the Carthage mint. The "X" is the denomination mark (10 nummi, also known as a decanummium). I don't know what "N M" stands for, but it's on all the coppers of this emperor from Carthage.
It's listed in Sear's "Byzantine Coins" as number 564. Similar to, but not the same as, this one on WIldwinds.
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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