Michael is correct, it is a Sumbawa knife. Used for ceremonial rice harvesting. Beautiful example. Such a knife is already long on my wish list. Look on page 74 in A. G. v. Z.
Handle seems to be from hippo ivory. Inscription most probable jawi.
Michael has shown a example in this thread: http://www.vikingsword.com/vb/showth...hlight=sumbawa
And here one more from Charles: http://www.vikingsword.com/vb/showth...hlight=sumbawa