Itīs an interesting hybrid: with a length of 77cm it has a dimensions of short sword, rather than a dagger. Still, the handle construction would point to an opposite direction. Plus, it combines a Y-shaped, forked pommel that could be found on some baselards, with a cinquedea-style cross-guard, composed of two halves joined at the end (were they forged / forge-welded?)
The blade seems to have a diamond cross-section, with a short fuller, so it could be rather rigid (from these pictures, itīs hard to say how thin it is). Iīd be interesting to try how it feels in hand and what are the stats (POB etc.) Have you seen any similar piece, probably with a better description?
Btw, I have zoomed ad details on HH website and it really does not look like a composite piece.

