Possible kalinga head axe

[imas560]

Hello all,
another item from the recent auction.
Was hoping to get comments on the axe. The axe head appears to me to be of Northern Luzon origin (Tinguian-Kalinga) but the haft is a little odd to me. Maybe of a later addition, the wood is a kind of greenish colour and absent of the usual spur. The collar(?) is also short. I have posted a photo with dimensions and thickness measurements. Any comments greatly appreciated.