There are several threads where this knives are discussed and never someone was able to pin down the origin, I've read Skandinavian, North Africa, Central Asia, Burma and the North of India. I personally would say somewhere between the last three, they have an Asian appearance to my eyes and I nearly want to bet that we have to look here to find the exact origin. Maybe the maker stamps can help by this.

Here can be seen more of this knives:
http://www.vikingsword.com/vb/showth...ghlight=khodmi