This is Giant Superman 19, published by Mimosa (SA Magazine Co) +/- 1963-1964.
It reprints the cover and both stories from DC Comics' Adventure Comics 285 (1961):
"Gravity Girl of Smallville!"
"The Shame of the Bizarro Family"
Also reprinted are these two stories from DC Comics' Action Comics 239 (1958):
"Superman's New Face"
Tommy Tomorrow: "The toys that stopped Space Crime"
Also reprinted is this story from DC Comics' Action Comics 221 (1956):
Congo Bill: "Congo Bill -- Witch Doctor"
48pages, glossy colour cover, black and white newsprint interior.
Here is the cover of issue 19 and DC Comics' original cover: