This is Batman 7, published by Mimosa (SA Magazine Co) +/- 1960.
It reprints the cover and the following 2 stories from DC Comics' Batman 126 (1959):
"The Menace of the Firefly"
"The Mystery of the 49th Star"
24 pages, full-colour, newsprint stock cover and interior pages.
These titles were printed in a smaller size (246x170mm) compared to the original DC Comics title.
The printing reproduction from the original was very good quality.
Here is the cover of issue 7 and DC Comics' original cover:
Mimosa Detective Comics Series
Mimosa Batman Newsprint Series