Dippy,
Nice finds all, well done. Those Heer daggers are all great in their own right, even better as a trio.
Not sure on the knot, looks like it could be a standard Feuerwehr knot but we'd need a better up close shot to know. See if you can move the slide up slightly to see if the wire is the same color underneath as it is in other places. A tarnished fire knot will often show silver underneath the slide.
