What you have appears to be a Roman 4th-century bronze centenionalis of Constantius II if I'm not mistaken. The reverse design appears to be a soldier spearing a fallen horseman. If @lordmarcovan could possibly move this thread to the ancient coins forum, you'd likely receive a more concrete answer.
Yes, I agree, it appears to be a late Roman centenionalis. Fasten your seatbelts. This thread will be moving to the Ancients forum in 3... 2... 1...
The reverse legend in Latin, FEL TEMP REPARATIO stands for Felicitas Temporum Reparatio, translated in English as "The Return of the Happy Times." It says a bit about Roman culture that a soldier spearing a fallen barbarian would match with such a hopeful and positive sentiment.
Yeah. “Hooray! Happy days are here again! Let’s go skewer us some barbarians!” Those Romans were really something, weren’t they? So civilized, efficient, creative, and industrious, and yet so bloodthirsty. Sign o’ the times, though. And given the subsequent history, it appears their optimism was a bit misplaced.
Constantius II A.D. 351- 354 D N CONSTANTIVS P F AVG; pearl diademed, draped and cuirassed bust right. FEL TEMP REPARATIO; Soldier spearing horseman; E in left field. In exergue SMTS RIC VIII Thessalonica 189
