Jirika a batch of these blades were made up in the 80's. I personally was burned on one of these. A $1500 lesson in why not to buy daggers on Ebay. mad Regardless, I suspect this is one of those bad blades. Ask the seller to send you a picture of the tang. The fakes were made with a hole in the tang. If this has a hole in the tang save your $. If not look closely for signs it's been welded closed.
Hope that helps, good hunting. smile
Paul