Hello Dave,
Thanks for posting this variant!
It's Batak and judging from the scabbard and overall appearance, I'd guess it originates from the PakPak/Karo border region.
The blade seems to be a Lopah Petawaran variant (or closely related type) as discussed in this
thread.
Your wooden hilt is unusual - looks old and legit though! I'd guess it's an attempt to carve the variant hilt type with exposed tang from wood.
Regards,
Kai