These are hand cut dies newly struck on silver I have heard was salvaged from 19th century European silver coins. The styl is not correct. The fabric of the fakes is not a match for genuine coins but adding some dirt an corrosion as here makes them look good enough for eBay. There are many dies and types.
@AngelDeath, @dougsmit This makes me sad. I was just thinking that maybe it would be nice to own at least one ancient silver coin. Now I am afraid I would not get the real deal.
These ones should not fool too many as their style is far from the original. These are as close to real money as Monopoly money is to currency. Ancients can be found but you need to familiarise yourself with them a little first or buy from people you trust.
Ii is is good to read your posts again Martin. I remember buying some really nice very early Tetrarchic folles from you many years ago -- still have them.
Advice taken. There is someone here that has the tag: "Buy the book before you buy the coin." (Something like that). And that is good advice, too. Plus, I enjoy the research. I never considered owning an ancient coin before reading about them here.