Is this a siraui?

[Ian]

More than 10 years ago I acquired this piece from the late Hank Spierenkamp. He called it a siraui. However, it does not look like examples of siraui illustrated in several reference sources, and I'm wondering if anyone has another name for it and an idea of where it originated.

The sharpened edge is towards the bottom of all the pictures. The hilt is upturned at its end, and the blade is slightly recurved, somewhat like a rencong. The hilt is polished smooth and I looked at it hard under magnification to see if it might be rhino horn--there is a defect at the end of the hilt that suggests it may be made of some type of horn--but I think it is more likely wood. (I'm willing to be persuaded that it may be rhino horn if someone has good reasons to believe that ).

Your thoughts about where it comes from, what it may be called, and the hilt material are all very welcome.

Ian.