This is All-Star Western 12, published by Mimosa (SA Magazine Co) in 1960.
It reprints the cover and all four stories from from DC Comics' All-Star Western 95 (1957):
The Trigger Twins: "The Riddle of the Reward Robber!"
Johnny Thunder: "Attack of the Gopher Gang"
Foley of the Fighting Fifth: "The Siege of Fort Desolation"
Strong Bow: "Secret of the Silent Indians"
Also reprinted is this story from DC Comics' All-Star Western 112 (1960):
Foley of the Fighting Fifth: "The Water Brigade of Fort Desolation"
32 pages, glossy cover and black-and-white newsprint interior pages.
These titles were printed in a smaller size (163x115mm) compared to the original DC Comics title.
This is one of the seven first titles that Mimosa started reprinting in 1959 (Western Comics, Tales of
the Unexpected, Falling in Love, Mystery in Space, Romances, Batman and
The Cover image used is not related to this issue's content.
Here is the cover of issue 12:
Mimosa All Star Western Series