Hi Bill,
Such spear is found typically found among the Bontok, Applai, Ifugao, I-lagod, Kallahan and Kalinga; possibly Tinguian, Kankanay and Ibaloi too; but less likely among the Ilongot (northeastern Luzon) and the Isneg of far Northern Luzon. Asymetrically barbed spears are less common than the asymetrical ones.
Based on the photos you had posted, I estimate it to have been made during the 1960s - 70s. I would guess Northern or Western Kalinga. My 2 cents.
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