Lastly, here a couple photos of one of the Kalinga axes. The axe head measures 15 7/16 inches in length; the spike measure about 4 1/2 inches. As mentioned, the thickness varies from a little more than 5 mm to +/- 3 mm. The axe, including the shaft, measure about 21 inches in height. The daughter thought the shafts might be made of monkey pod. The metallic inserts are a mix of ferrous and non-ferrous metals.
If I have enough light, I might try to take a photo of the other pieces I acquired.
Thanks again to the three of you - Vandoo, Bill, and Battara - for your input and information.