Weapons of warriors from Omo river

[KraVseR]

Viewing photos and a couple of issues of "Tribe" with Bruce Perry, I came to the conclusion:
Spear of the Omo Valley had a long and wide blade, like many other African spears. However, their staff is very thin .. Spear used for close combat and for throwing. The average length varied from 1.5 to 2 meters. Sometimes on the opposite side of the blade was Drift pin.
Right?