IT MAY BE AN ADZ USED TO REMOVE THE CENTER PITH CORE OF THE SAGO PALM. THE SAGO IS USED AS A MAIN FOOD SOURCE IN MANY AREAS WHERE A SORT OF BREAD IS MADE FROM IT IT IS A MAIN STAPLE ALONG WITH TARO, BREADFRUIT AND COCONUTS IN MANY AREAS. THE SAGO PALM TREE IS CUT DOWN AND STRIPPED OF LEAVES AND THEN SPLIT AND THE CORE REMOVED USING TOOLS SIMULAR TO YOURS. THE INNER MATERIAL IS THEN BROKEN UP AND TREATED SO IT CAN BE EATEN AS IT CAN'T BE EATEN RAW.
SO THATS MY BEST GUESS AS TO WHAT THE THINGIE IS.
