Slim Kojuk Mrenges Keris Hilt from Madura

[COYOTE]

Thank you David, Maisey and Jean for your concern and precious information.
I am sending other 4 pictures that might help for identification of the material, marine ivory (dugong tusk or whale tusk or other marine animal..) or elephant ivory).
I could not see Schreger lines on the pieces but it may happen because the piece is old and has a very dark patina.
Other 4 pictures are being sent.
Thanks again.
Cheers !!