The nearest I could find on Wildwinds was a bronze AE 22 or AE 30, Emperor Tiberius, of Carthago Nova, (Spain) Obverse Tiberius bare head right, reverse Caligua, bear head right.
NOT an exact match, but may lead to a better attribution by others.
I agree that if looks suspicious. I think it is a cast fake 'pickled' in acid. A flat sprue (6 o'clock) was broken off and left in a rough unfinished condition.
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