MY FIRST GUESS WAS A TEATHER TO BE STUCK IN THE GROUND FOR SECURING SMALL ANIMALS I ELIMINATED THAT AS IT WOULD NOT BE EASY TO HAMMER IT INTO THE GROUND WITHOUT LEAVING MARKS.
MY SECOND GUESS WAS A FINAL TO BE PLACED ON TOP OF A CEREMONIAL POLE BUT I NOTICED IN ONE OF THE PICTURES IT HAS A BARB ON THE SHARP TIP WHICH WOULD NOT HELP TO DRIVE IT INTO A POLE.
THIRD GUESS SOME SORT OF TOOL AND PERHAPS OTHER TOOLS OR KEYS COULD HAVE BEEN ATTACHED TO IT AT SOME TIME IN THE PAST.
SO I GUESS THAT CLASSIFYS IT AS EITHER A THIMAJIG OR A WHATYOUMAYCALLIT.