Nice stick Lew. I would agree with Colin early 20th cent. It seems to be a fairly common type. I have this one which is more of a dress stick being only 73cm long. A sign of its lateness to me is the opposite end to the ball, which has a slight bevelled edge and the end has been dressed flat by a file. I know files have been in use for centuries but all the early short sticks that I have, not having contact with the ground have been carved or worn/rubbed at the end. To many collectors this lateness may cause some disinterest but one has to realise how much parts of Southern Africa were like the wild west. Traditional warriors still engaging in conflicts untill 1906. Like in this link, the only survivors two Americans and an Australian.
http://en.wikipedia.org/wiki/Shangani_Patrol
It is fasinating how worldwide things like this, swords and knives seem to come in roughly the same set sizes. I suppose we are all humans.