I am not a collector of daggers, but I do not recall ever seeing a fullered (blood groove)dagger.
Most quillion daggers have a flattened diamond shape blade, which makes it nice and strong against bending to the side when stuck in an opponent. A fuller (blood groove) would make the blade flat and make the blade extremely weak at the fuller. Why would he do that?
The purpose of a fuller is usually to save weight by removing steel, or for a little added strength. The purpose of a fuller (blood groove) is NOT to let blood out or let air back in the body! Those are old wives tales.
To put a fuller on a quillion dagger would probably mean it would bend at the fuller when attempting to stab with the dagger. Even an apprentice would have in his head the geometry of a usable blade and be able to spot the obvious weakness in that design.
I hope I didn't ruin your story, but I perceive the reason for your visit to AAPK is for historical accuracy in your story.
Welcome aboard.

_________________
Dale
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