OK, I am stumped?!
This is the snout of a saw-fish, right? The pics are dark, so perhaps I'm wrong? Sawfish snouts were used in the Polynesian colonies (Kingsmill Isles for sure, among others) to make wicked swords, but I know some sailors also made ship-board bric-a-brac swords not really meant for combat. How on earth did such a finely wrought hilt end up with such an odd attachment?
Actually, looking at the grip, with its fur tufts, I'm beginning to wonder if this might be a composite sword perhaps made by indiginous tribes using left-over parts?? This is a weird one, but fascinating!!