Caesar countermarked coin?

Hey guys. I just pulled this from the olive oil. I think that it has seen better days, but it is cool. Can anyone attribute this? What is the denomination? It is bigger than a US quarter. I wish the countermark was a little clearer, but...



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That coin looks like a possible rock tumbler candidate. By the time olive oil removes that crud, a Statehood quarter will be as old as that coin is today.
I dunno about the counterstamp, either, but it's cool. Maybe with some added decruddification, it will reveal more details, but I rather doubt it.
Edit to add the pic of the Claudius as from my old collection for comparison. It might have a different reverse, though.