Hello Lew, I don't remember ever seeing any edged weapons from the Philippines with stacked horn and bone hilts before (but there are a lot of things I haven't seen) though I have seen quite a few daggers from Mexico with this style of hilt. Very nice dagger and the sheath looks to be in great shape !!! Does the blade have a raised medial ridge (I can't tell for sure by the picture) and if so does it have one on both sides or it the blade flat on one side, or is it oval in shape? I think that I will wait to see what the experts have to say on the origin of this one.
All in all a very nice dagger and I think you should box it up and send it to me.
Robert