South-east Asian dagger needs a brainstorm

[Radu Transylvanicus]

Something I acquired last year. I know for sure it comes from the Philippines but I want better than that. Here is what I think it could be:
A Moro (Tausug?) punal / punal de keris known local as gunong. Can it be older than mid 20th century?
The ulu-ulu pistol hilt is made of a stained hardwood. The salungan or sheath is made of red wood (likely narra wood) and chased brass rings. A long punto or ferule of brass rings makes the transition to the long solid blade simply adorned with one crude grove. Back top mount ring has a chassed and pierced work loop-clip (how is that clip named?) pretty fancy craftsmanship.
Seems rather small in my hands, at least the grip, blade is fairly well sized. I hope the picture sizes is OK...let me know if you need more details...