CONGRADULATIONS ITS A NICE ONE
FROM THE FIRST PICTURES I THOUGHT IT HAD A TANG AND THEN A METAL FERRULE LIKE MANY INDONESIAN SPEARS I HAVE SEEN. THE OTHER PICTURES SHOW IT TO HAVE A BUILT IN BOLSTER AS WELL AS A SOCKET RATHER THAN A FERRULE. THAT MAY HELP PIN IT DOWN IF SPEARS FROM THE CELEBES HAVE THAT FEATURE.