Hello Kate,
I do not know if this will help but I am pretty sure it is from somewhere in Central Africa where the use of zinc is common for decorative purposes. I suspect the Congo. There are not that many ways to make barbs on a spear, however they can still be distinctive. Look at this copper currency spear head and note the method of forming the barbs in contrast to the Nuer, so called fishing spear. I am sure it will not be too long before other members give a more accurate origin. Tim
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