Hi Leif,
very nice big gunong! Like Ian I think that it is older, around 1930s would be my guess, compare size and quality with your example on the complete left from your family picture. And I guess that the plain rings at the handle are indeed from suassa, let test it if there is gold content.
Here a very similar (in blade style) examples from my collection:
http://www.vikingsword.com/vb/showpo...80&postcount=6
In the meanwhile I've acquired another one with the same blade style.
Regards,
Detlef