Knife with interesting markings - Ebay

[Rick]

We hate speculation, but I still wonder,

Is this a Philippine piece with captured insignia; or is it a Spanish captured piece remarked with Guidon and unit emblem ?

Obviously the knife is Katipunan; but whose hands did it finally wind up in ?
I'm guessing Spanish along with David .

Is the sheath original to the piece?
There is an interesting lug at the pommel end; almost as if it was made for a sheath with a pommel strap .