Hi Chris,
Now I understand your partiality for those daggers - it's no wonder at all as the illustrated Frontiersman sample doubtlessly corresponds to, or is well based on, the so-called Maximilian type of ca. 1500 German
Grosses Messer and contemporary daggers, showing the same stylized bird's head pommel.
Sadly my

scanner is on strike at the moment but I will try and post some originals of ca. 1500 soon.
From my computer archives, I attach details showing the latest form of a bird's head pommel on a backsword, from a painting by Lucas Cranach the Elder of 1535, titled
Judith with the head of Holofernes.
Best,
Michael