Primitive Fishing Spear. Unique Item! Unknown Origin

Primitive Fishing Spear

This is an interesting and unique item. I purchased it 9 years ago at an auction in a lot of primitive African masks which I've sold separately; the auctioneer had no information about any of the items. I also have no knowledge of these kinds of items, other than they were interesting to me at the time, so I purchased them. I was primarily interested in the masks. I wish I knew more about this, but I don't know where it originally was made or when or who might have made it. It's simply a very interesting and attractive item , and it would seem to me that it would have been very effective in skilled hands. It's approximately 54 inches long and about 3/4" to an inch across at the widest part of the spearhead. The shaft appears to be of bamboo or a bamboo-like reed and the head of the spear is very hard, made of a dark wood of some kind, I believe, or perhaps bone, and the barbs are very sharp and effective, I assume. The spear head is lashed, as shown, to the shaft with strips of bamboo or reed. I notice that the end of the shaft has a rather rough edge; I don't know whether it was broken or this is its original length.
If anyone can share any additional, more knowledgeable information about this artifact, I'd be interested to share it here. Thanks for your interest.
Note: Because of the unusual

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