Hi Gaspare!
It's a sell from a Finnish estate of a deceased person. Do you have any photo of an original ring with this pattern? Is it german or finnish? I've never seen this exact pattern before. These are the only photos I got, but to me it looks alright. The seller got good reputation but when it comes to this ring it's quoted as an SS honor ring, so the seller doesn't have that much knowledge about ww2 rings.