This dagger is called a gunong. I don't really know much about them but there are people here on the forum that are experts and I'm sure that they will be answering soon. If you would please post the measurements to go with the photos. Here is a good thread to start with for other examples.
http://www.vikingsword.com/vb/showth...light=ferguson Good luck with your collection, you will find it has a tendency to turn into an addiction!!
Robert