Rightho!
Just thumbing through a Swiss avmag (Cockpit) and find a photo of Challenger ZS-ALT at Lanseria. Caption goes on to say that the first ZS-ALT was a Miles Magister operated from 1938 to 1940 by SA Airways.
Must say I have enjoyed accompanying you on this thread for almost a year now, and appreciate the works of DamienB and MOTF in illustrating your aerial activities.
Best wishes,
ATB