Another 3 old African spears ...not certain as to origins

[katana]

Added another three spears for my 'picket fence' display .....well when and if I get permission from the 'other half'

All nicely balanced throwing spears which have had a lot of use .... the 'wear marks' on the shaft match the 'balance point'
Although they are socketted, two are different to any other similar type I have owned. The sockets are more 'open' with a groove that accommodates the shaft. A hand forged nail helps keep them secure. Does this design help in ID'ing the spears origins.

All information, comments gratefully received Thank you

Regards David