Thank you Richard for your explanations. Neither am I a piper, but I am an amateur musician. We guitarists would call that 'imitation ivory' - "ivoroid" and know that only because it is all over our guitars in various locations, and is used mostly because of the legal barriers of importing real ivory. And on that subject, if the Robertson pipes employed real ivory, would they not be illegal to import-export these days? We also know rosewood from southern Asia referred to as "East Indian Rosewood" (and has similarly been employed starting about 1970 due to the same legalities as that of Brazilian Rosewood), but I am an expert in neither ivory or wood (and know absolutely nothing of "Sheesham"), so I make these comments only as questions or observations from my personal limited knowledge base.

Regardless, I enjoyed your explanations.