Well it finally arrived. Wow, this thing is big. It definitley is not a functional axe.
Here it is with my iKlwe.
The tiles on the floor are 13 inch/33 cm. The overall length is 43 1/2 inch/ 110 cm.
The blade is 13 inch/33 cm from tip to tip. The nose of the blade is 5 7/8 inch/15 cm from the haft.
The blade is attached through a hole in the haft and secured with metal wedges.
It appears to have been hand forged with crude tools.
Since I am in no position to dispute Chief Buthelezi's use of this axe, I am going to call it a Zulu Chieftains axe. Ethnographic, but definitely not antique, from late 20th Century.
And the best endorsement, my wife thinks it's neat.