Philippine knife for identification

[Sajen]

I have won this Philippine knife by ebay. I have never seen a similar knife before and I am unsure if it is a Luzon or Visayan piece. Blade profile tells Luzon but I think that the scabbard had has once a leather at the throat which would suggest that it is a Visayan knife/dagger. What do you think? Or did someone know exactly what is and will be able to give it a name? It is 9 5/8 inch inside scabbard with a blade lenght of 5 3/4 inch.