To me it is UNDOUBTEDLY ivory!
There are many extremely good imitation materials for ivory, but I am not aware of any capable of replicating the Schreger lines.
The hot needle test is literally stupid and useless. Stupid because it can damage an art object and useless because there are some Ivory imitations that would pass the test (I personally have some).
The black dots are equally distributed and almost certainly are markings from a crown- or flower-shaped pendok. Also most certainly they can be polished out easily.
It is a very beautiful hilt!
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