Very interesting... for whatever it's worth, I find that the majority of Afican spearheads with tangs are from S. Africa, with most central and N. African pieces socketed.
Yours almost has the appearance of being from the Philippines or Indonesia, from what I'm able to discern from the photos.
While the woven brass would be fairly consistent with the Zulu or at least the Zulu nation, the brass ferule and the clear, concise forging makes me think that it might be from the Philippines, but I'll wait and see what Freddy has to say.
At any rate, congratulations and DO NOT succomb to emptation and take just one practice throw at a tree.....getting it back out can be VERY challenging, to say the least!
Mike