Well, probably I'm wrong, but to me it seems one of those Sudanese "copies" of indo persian weaponry (haladies, axes, ecc.)
In that case this would be a Sudanese reinterpretation of an indo persian war hammer (with a zaghnalic beak) wich is in "per se" an interpretation of the medieval european war hammer.
In any case, I agree that the finish is not very African, exept the reptile skin...
