Knobkerrie unlike any other? or something else

[fireiceviper]

I acquired this when purchasing a couple of other items, all they knew is that it came from the grandfather who went to afrika a couple of times but to where and why the could not recall.

The shape looks typical of a knobkerrie, the carvings however i have never seen , it really looks aged and i believe it is.

The patterns on the head have similarities with Tongan clubs but i think thats pure chance.

Anyone have a tribe or a region? or something similar?