I have
inherited this coin/medallion from my father, it has been in the family since at least 1851 when my family immigrated to America. I am trying to find an exact/estimated time period in which to date it to. local dealers think it might be a medallion since there is no writing on the face or the back, they all agree that it is roman in origin. it is very worn enclosed are pictures of the face and back. Any help in this matter would be greatly appreciated.

Identified - moved to British Coins forum - Sap