Nice looking coin, very nice looking coin, too nice a looking coin. I think it is a Paduan. (Venice, Italy). I have never seen a genuine Roman bronze with that edge, especially with raised initials. I am not dissing your find. The copies were made in the Middle Ages for wealthy collectors by master artisans. They were not affordable for the common man, but were custom made for the rich. I had three examples years and years ago, but unfortunately sold them. I got basically a day's pay for each of them. It is truly a nice find.
H.H.
Phil