looks like a javanese trident, which would be inserted in a socket in the end of a pole like a spear. some spearheads get mounted as daggers tho. not sure about tridents.the pamour (laminated and arsenic washed) steel is nice. it also pins down the area to indonesia. the only other ones similar i found googling were listed as javanese. a forum search didn't bring me any examples either. personally it looks fairly new, hasn't been 'washed' much. but i am not an expert in this area (if any
) anyhow, i like it.
a fairly unusual item. hopefully the keris guru can flesh out the details.