This is Giant Western Comics 2, published by Mimosa (SA Magazine Co) in 1962.
It reprints the cover and both stories from DC Comics' All-Star Western 118 (1961):
Johnny Thunder: "The Eyes of Johnny Thunder"
Super-Chief: "The Invasion of the Indian Giants"
Also reprinted are these two stories from DC Comics' Western Comics 48 (1954):
Nighthawk: "The Two Faces of Nighthawk"
Rodeo Rick: "The Runaway Rodeo"
Also reprinted is this story from DC Comics' Western Comics 51 (1955):
The Wyoming Kid: "Secret of the Silver Star!"
48pages, glossy colour cover, black and white newsprint interior.
Here is the cover of issue 2 and DC Comics' original cover:
Mimosa Western Comics Series