Now that looks like an old and much handled piece of ivory. Lovely patina and carving that has been fondled.
The shape reminds me of one that our host, Lee, posted on the old Forum. I think we concluded it was an older style and more likely to be Malay or Brunei than Sulu or Mindanao.
I will look for that old thread.
Ian.
Edit: Here is the thread http://www.vikingsword.com/ubb/Forum1/HTML/000589.html but Lee's pictures are no longer there. However, there is a picture of Datu Piang (page 2) with a similar hilted sword