Actually many southern Sudanese spears did use bamboo, and from I understand this was from Nuba regions. This barbed style spear does seem to resemble some Sudanese spears, though it does seem rather sheet like steel and more likely fairly modern. Interesting on the coiled wire also, and how surplus or salvaged materials are always put to use in these ways, incredibly industrious.
It does seem that Zande, as David suggested might be quite possible also, as they are situated in regions of southwest Sudan, along with Congo regions in the northeast part, and the influences mentioned might well be a factor.
All best regards,
Jim
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