From the auction:
Appears to be original but, I make no claim to that effect. Sold as-is. No return.
I think if you put this into Google translate you'd probably get:
"This is obviously a copy, if you can't see that up front then don't come crying to me!"
I've not seen all that many C64 disks but even I know that they mostly look like fakes....
Caveat Emptor!