Perhaps the picture is not as clear as it should be, but the portrait looks more like Roman type armour than anything else. The shape suggest that it was cut from a sheet of stamped 'coins'. It could always be some sort of decoration?
I obtained this coin among a lot of uncleaned Roman. I have researched Byzantine, that it resembles, without success. It has been suggested that it could be on of the early Indian States. Any ideas? Unknown1r.jif