Hi Dave,
That's an amazing piece - all the way down to the shape of the blade. Can you see what's inside the amulet ball? You're spot on with the Crocodylian origin, but these seem to be the teeth supported by inserted wooden pegs (they're kind of fragile near the base. On the really high status/old Balatos, from a time when tigers were still plentyful in that part of the world, you also sometimes see tiger canines on these balls.
Thanks for sharing!
-Thor
Edit: Ah, re-reading your post, I remember you already described the contents of the ball - cool.