Sewar or not? If not, than wot..?

[David]

Originally Posted by gp

The hilt is neither horn nor bone I can say as it is too heavy for that:
it became detached and looks like the ivory I have seen from the better Ottoman yataghans but am open to any advise if you know any other heavy material?

I think we would need to see better photos that are closer, sharper and better exposed. Can't read much in those blown out sections of photo. I don't see any obvious Schreger lines so if it is some kind of ivory perhaps it is not elephant ivory. But it looks a bit porous in some spots and if i just had these photos to go by i would still suspect it was bone.
And yes, i think it would be fair to consider this Indonesian, though i am not sure of the exact origin.