Tsonga club

[The Double D]

Spring in African Arms and Armour describes a Tsonga Club as follows:

Tsonga clubs with a spherical head are similiar to certain Zulu weapons, but a variety with an elongated, oval head and striated patterning was said by Junod to have been made in Bilen town and was particularly popular in Gaza province.

This club seems to fit that description. Does any one have any other ideas.