WOW, very nice!
It's an Ifugao spear, see here for a similar spear point:
http://www.vikingsword.com/vb/showth...ighlight=spear
And here another interesting thread in this matter:
http://www.vikingsword.com/vb/showth...ghlight=ifugao
The binding in up and the butt is the give away for the origin also.
Regards,
Detlef