In the book Death Stalks the Philippine Wilds, Letters of Maud Huntley Jenks who was married to Dr. Albert Jenks, there are neat little hand drawings that distinguish Bontoc and Kalinga weaponry. According to these drawings, if I remember correctly concave heads were Kalinga and convex heads were bontoc. So that would make the 1st one Bontoc and the second Kalinga.
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