I have also a question about rencongs!
Where these rencongs made of elephant fossile molar hilts made for use or just for touristic perposes?
Elephant fossil is not a standard material for rencongs, afaik. Your piece, doesn't have the look and feel of acehese aesthetics. The shape at the base of the blade is round instead of a hexagonal profile, the arc of the blade and the shape and design of the sheath... hmmm... perhaps a tourist piece (?)