rick,
your spear appears to have the profile of a moro budiak. in my opinion it could have been reserved for a ceremonial purpose - wedding, courtship along with a
panji perhaps... its too beautiful for battle. as to tribe, i'm certain it is not yakan, the ferrule is too long almost the length of the blade itself to qualify as yakan.
zelbone,
i do not have budiaks from other tribes.
here is the only link i found with reference to a sankil:
http://litera1no4.tripod.com/yakan_frame.html
the sankil has a wicked hook-like design meant for thrusting and pulling out a person's guts.