This is one of the earliest South African reprint comics. Zebra Publications were the first to reprint DC Comics in 1954.
This is Zebra Publications Superman 5 - the cover is taken from DC
Comics' Superman 75 (1952).
It contains this story, taken from DC Comics' Superman 65 (1950):
"The Testing of Superman!"
Colour cover, Black-and-White interior, 24 pages.
Smaller than the original comic size - dimensions 176mm x 244mm.
Here is the cover and DC Comics' original cover: