ID of a spear

[blacklacrau]

Hi
I would like to know some information concerning this spear.
the salesman sold it as being a dayak. He seems to me that is a tombak.
I liked to know some information concerning the age and of the origin of this spear.

a spear whit a shaft so small spear served for, as a weapon?? for the hunting?? ceremonial purpose?? The blade is a bit rusty, but I see some 'pamor'. There is a metal ring in the shaft, near the blade.
Perhaps someone on the forum can help clarify things.

Total length is 57,5 cm

Best regards