you may be disappointed that nobody respond to your new pictures. This knife is a puzzle IMHO, I don't think it's Bicol, it's not Borneo I think but I am also not very confident that it is from one of the Igorot groups.
And I think that others are similar unsure from where exactly it coming, a reason that no further comment was given. The binding is very Moro but I don't have seen such a binding by Igorot weapons. The blade surface is a little bit to rough for Igorot (my feeling).
But it's very interesting and I would like to know from where it is exactly.