This sort of broad, general weaponry is a bit outside my knowledge base, so what I'm putting up for consideration cannot be taken as any sort of expert opinion, only general knowledge based on experience.
There is a Batak sword like this that has a hollow grind --- ie, concave blade face --- it has a name something like rudos, or rodos or similar. Over the years I've had several, and quality and detail varies a lot.
This style of bifurcated hilt is usually associated with Sumatra, lots of stylistic variations, but in other places, including Sulawesi it is somewhere between rare and non-existent.
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