"The Montana Bladesmith"
There's a reason that for the ABS Mastersmith test, the applicant is required to present a European style Quillion Dagger, and one of the 5 test knives..... it is the most difficult knife design to accomplish correctly.
It's because a dagger is basically "double" everything of a single edged blade/knife. With a standard, single edged blade, you have a "face" on one side, and that "face" should match the "face" on the other side. With a dagger, you have TWO "faces" per side, and not only must the two faces on a single side match, but those must also match the two "faces" on the other side. The other unwritten rule for the dagger, is that it must have a fluted handle, with inlayed twisted wire.....usually either 24k gold, or 99.9 pure silver wire(s).
Personally, I made the blade of my dagger 3 times, and the guard & handle 5 times, before getting it right. So if anyone wants a "knifemaking" challenge, go build a European style quillion dagger!