Philippine head ax origin, use and information

[Bill M]

I am being asked by a Discovery crew to give a short talk on the Philippine head ax. I believe this is some kind of antique/unusual object road show.

Apparently they have one that is not a great example, so I need information about the origin, use and any other information this erudite forum can kindly provide. I do have a very good quality head ax that I will bring to the video interview.

Your responses are greatly appreciated!