Dear David,
This is a strange combination.
The general form of the handle looks like examples that can be found on the finest of jimpuls.
But the blade is not a Jimpul, and the handle shows all kind of motifs, but nothing that one would expect.
Also the small metal pins that are in the handle is something I have never seen before.
But than again, personally I think that people from Borneo are open to influences from outside borneo and maybe this carver was inspired by foreign motifs. It must have been a skillful carver for sure.
But the odd motifs make it difficult to give it a place and date.
Never the less, good choice to take this home from the antique mall