Hi Anthony. Yes Kusia or Kocet-Kocetan hilt. I wouldn't say it is new, but i would imagine much newer than the blade. The sheath is probably the newest part of the ensemble.
I think you are probably safe calling this blade 19th century. It would be nice to see a photo of the entire blade so that we can see the proportions.
Keris pedang may well have been used by warriors, but my understanding of kocet-kocetan hilts is that thy were most appropriate for the priestly class. I would image this is more an ensemble put together for appearances than actual societal or cultural purposes. I nice acquisition regardless.
