I would go with Gav on this......very much Philippines, and the faceted grip is similar to a number of weapons I've seen in essentially a espada ancha type hilt. This is however more in the form of a plug bayonet, a weapon that remained in use in form much longer than often realized in the Spanish cultural sphere. Since Chinese influence distinctly prevailed in these regions as Gav has astutely noted, the alternating quillon guard of the dual 'butterfly' fighting knives seems reflective in styling.
Good points Rick on the thimble potential!! Recycling at work
All best regards,
Jim