Very unusual old keris , any ideas ?

[Jean]

Originally Posted by Bob A

No expertise here either, but it has the look of bone to me.

Aside from the appearance of bone, the dagger has a utilitarian look, on which I doubt ivory would be used.

I am not sure about the hilt materials either from the pics but it is not whale bone, nor buffalo bone (which would be pitted inside), so I tend to believe that it is either marine ivory or tanduk rusa (deer antler). However the piece may be too large for being carved from deer antler.