Hello Bill,
I'm pretty sure this is an ethnic Malay example - Riau, Straits or even eastern Sumatra.
I wouldn't rule out Borneo/Brunei but most examples collected from Borneo seem to have originated from Sulu (or being crafted in the same style) with some trade blades from Mindanao thrown in the mix. Also, I don't recall any pamor blade from Borneo nor Moro provenance, especially not this pamor (even welded in low contrast).
The gangya configuration is keris-like and doesn't fit into Cato's categories. So, all bets are off on this piece... However, the carving of the blade is really nicely done and I'd guess it has some real age. I'm less convinced of the fittings, especially the clamp might be a quite recent replacement.
BTW, it's easy to tell ivory from giant clam shell with the help of a reasonable magnifying glass - the latter is quite porous and shows different growth rings.
Regards,
Kai
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