It is not
harshly cleaned - well it is that too - but the edges were worked with a hard steel implement. cmcdon said grinding wheel, I think just a simple steel hand file. Either way it was for finishing a modern
cast.
The more important point is that the
style does not match anything actually documented as ancient.
Though you can't prove a negative the logic challenge for such things is simple:
There have been literally millions of ancient artifacts excavated and documented. Tens of thousands of photos can be found online. Finds are also documented on thousands of books and journals. The onus on anyone trying to prove something is a genuine ancient object is to find a parallel or a stylistically similar parallel. Discounting online crap from dealers in
fakes and other scam artists nothing similar will be found.
SC