B.A: nice that you are bringing these picture to the attention of the world!
Being one of the two owners of the "Dok Viljoens", as well as a 301 and 90% of an SP10, I can confidently report that the Dok Viljoen is to the other two as a Panzer is to a Lexus, or Jaguar.
A key design feature of these is their ability to 'instant start' at the push of a button. The heavy platter can be lifted and lowered by means of a solenoid around its main bearing. On top of the platter is a light aluminium disc - bright blue, that rests in that large bezel surronding the platter when the platter is lowered. Energising the solenoid raises the already rotating platter so it picks up the stationary disc and record, bringing it immediatly to playing speed.
The "Mark 3" as shown in Blue Angel's post was made around 1975, and was the last in the series. I think these didn't compete with tape, but would have been used for music programs (the SA Top 20, Forces Favourites, Hospital Time etc.).
Also, most commercials and jingles were on 10-inch discs, so each studio had around 4 to 6 of these installed. There must be plenty of them still out there somewhere!
There is a grainy picture of an earlier (Mark 1 or mark 2) here http://www.springbokradio.com/sitebuilder/images/docviljoen-251x198.jpg
which dates back to around 1950. The earlier ones were (so I'm told by a broadcaster) two speed only - 45 and 78.
I put some photos of mine in the gallery a while back when I got here:
(These pics were taken with an SVHS video camera! I can do a bit better now)