The Swiss Dagger was also known as the Holbein Dagger, designed by someone called Hans Holbein. On the link below, you'll find an interesting sketch of the design on the dagger by Hans Holbein in the 16th century. It even shows the dagger with potential down-pointed quillons, and the curves in the hilt displayed in this one. The basic dagger design was later used for the Nazi SA dagger.
The Swiss Dagger had a diamond section double edged blade, as this one looks to have. So all in all, I'd say it's looking to be a pretty strong contender.
http://www.tate.org.uk/britain/exhib...ooms/room4.htm