Hello Leif,
I think it belong to the same family as the small ones in down on this picture, it's the collection from Ron, once shown in this thread:
http://www.vikingsword.com/vb/showth...ghlight=gunong
I own also such a gunong but with wooden handle. Also shown in the above thread. I think you are correct about the pommel material.
Regards,
Detlef