This is Mystery in Space 3, published by Mimosa (SA Magazine Co) +/- 1959.
It reprints the cover and the following 2 stories from DC Comics' Mystery in Space 48 (1958):
"Secret of the Scarecrow World!"
"Amazing Mirages of Space!"
24 pages, full-colour, newsprint stock cover and interior pages.
Here is the cover of issue 3 and DC Comics' original cover:
Mimosa Mystery in Space Series