Agree looks off. Wear, patina and thickness seem different to me compared to authenticated ones. Although, thickness can vary for many issues. This is a relatively rare coin. From what I see, north of $500 at auction in this grade In current market. Although I don't see too many sales of it. Not likely to be sold unattributed or even unauthenticated, but these things happen in ancients. I'm sure another member of the community can shed more light.