

Ok so this one is going to be a bit tougher but I'm just curious as to the emperor. I'm thinking Constantine but can't be for sure. The reverse has a clear "R" with a figure in it so any information you guys have is grateful.
I've also cleaned this coin with electrolysis. I know patina and all of that crud so no need to remind me but would it be easier to identify if i futher used electrolysis? This is new to me and I worry about leaving it in too long and damaging the coin.

