Hi Robert,
My first PI piece was a bolo like yours that I found at a yard sale. It's the 2nd piece from the top in the photo. In my first post here on the old forum, I was told it was from Iloilo on Panay, in the Visayas. The knob hilt with the long ferrule seems to be common in that area. It's still one of my favorite types of bolo.
Steve