update:
I contacted the guy, and he removed the listing.
He said he bought it from a "coins dealer" therefore " it must be authentic", then i sent him a picture of the real thing, and the listing is gone. Refreshing.
Now we will see if the 1758 5 kop silver i bought from him is authentic. I bought it before he listed the fake, and raised my suspicions, but the coin was already shipped when i contacted him.