Ian, I base my thoughts on what I have seen of Ilanun kampilans, especially the hilts, which are like this one and do not seem to have "eyes", as well as seemingly slightly truncated pommel with a larger lower "jaw".
Some discussion was done here:
http://www.vikingsword.com/vb/showth...2&page=1&pp=30
Also here is a page from Holstein's book: Iranun and Banalingingi (1860).