This is Detective Comics 6, published by Mimosa (SA Magazine Co) +/- 1962-3.
It reprints the cover and both stories from DC Comics' Detective Comics 312 (1962).
"The Secret of Clayface's Power"
Martian Manhunter: "J'onn J'onzz' Pesky Partner"
Also reprinted is this story from DC Comics' Detective Comics 279 (1960):
Roy Raymond: "The Creature from the Sorcerer's Stone"
32 pages, glossy cover and black-and-white newsprint interior pages.
These titles were printed in a smaller size (265x178mm) compared to the original DC Comics title.
The printing reproduction from the original was very good quality.
Here is the cover of issue 6 and DC Comics' original cover:
Mimosa Detective Comics Series