I have added an enhanced picture.
Fistly I think the only thing 'zulu' about this piece IMHO is the style of the wire binding.
Secondly the chances of this being a weapon has been greatly reduced since I have enhanced the picture. The spear end appears to be tanged but is only short as it would hit the portion of the the axe head that passes through the shaft. This arrangement would make it 'weak'....far better would be that the axe and spear head were forged in 'one piece'.
It also seems that the 'axe' has not got a sharpened edge, is relatively thin and seems to be made from uniform sheet metal, rather than forged.
The circle motif, although common to Africa, the Middle East and Asia is something I have not seen on any Zulu artefact... (so far
).
The more I look at it, the more I believe this item is 'made-up' , based on an European idea of an 'old' weapon. Either concieved in Africa...to sell to tourists. Or worse ....made in Europe perhaps to deceive.