Seadajak Parang with rare scabbard

[VVV]

That's a bit odd if it should be Dusun as they didn't produce ilang themselves but acquired them from Sarawak or mostly Kalimantan?
The parang they did manufacture is the gayang with flat sides and usually ornaments on both sides.
Maybe your parang ilang is from one of the coastal tribes in Sarawak instead of Dusun?

Michael