I also had seen that on Ebay and considered bidding, but I didn't, I think it is a fake.
The patina has some rust, but silver don't rust, than comparing the actual picture with the one on Numista, on the Ebay one the 2 is far away from the 5 on the right, and the 3 fingers raised are closer to the lettering than the Numista picture which I take for granted is original.
These are some details my inexpert eye catches, there maybe others.
So I did not bid on this and I think I did good!