I have some early roman silver there is lots of it around
the ones with BC dates are especially common and cheap direct from China for some reason
The one thing i ensure before i buy Roman silver is that it is confirmed by NGC to be authentic. I buy only coins that are in NGC slabs. The most expensive coins are early emperor coins which are usually AD age except for Augustus. But Julius Caesar and other famous BC Roman figures have coinage that could be faked. And it would be since they have value in the collecting world.
I think the Chinese knockoffs can usually be distinguished by their Latin slogans praising Chairman Xi.