War Museum Joburg, collection of Armscor in the Armscor building Pretoria and at Fort Klapperkop in Pretoria.

The latter two have most likely gone to bits due to a lack of interest and qualified personnel.

Come to think of it the National Cultural History Museum in Pretoria might just have a few examples. NCHM is part of the Ditsong Museums together with the War Museum. Person to talk to at NCHM is Jan van den Bos.