Hello Gionloc,
Welcome to the forum! I am very far to be an expert regarding jambiyas, see here:
http://www.vikingsword.com/vb/showth...hlight=jambiya
But when I understand some comments in the given thread I would guess that the jambiya in question is a tourist item because the blade seems to be made from two sheets soldered together like one pic of yours show clearly, sorry for the bad news.
Regards,
Detlef