Well, the reverse is clearly a FEL TEMP REPARATIO. Showing a soldier spearing a fallen horseman. The question is, who is on the obverse? The typical suspects are Constantius II, Constans, and Constantius Gallus. Gallus appears bareheaded, and that’s my best guess for this coin. Let’s see what others say.
If I were to guess a mint, it would be Constantinople. Do I see CON in the exergue? I’m not sure, but I think I do.
