This is All-Star Western 14, published by Mimosa (SA Magazine Co) in 1960.
It reprints the cover and two stories from from DC Comics' All-Star Western 113 (1960):
Johnny Thunder: "Challenge of the Outlaw Horse!"
The Trigger Twins: "Secret of the Six-Shooter Salesmen!"
Also reprinted are these two stories from DC Comics' All-Star Western 97 (1957):
The Trigger Twins: "The Decoy Sheriff!"
Strong Bow: "Quest for an Indian Name"
32pages, glossy cover and newsprint black-and white interior pages.
These titles were printed in a smaller size (187x132mm) 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
Here is the cover of issue 14 and DC Comics' original cover:
Mimosa All Star Western Series