This is Metal Men 4, published by Mimosa (SA Magazine Co) +/- 1963-1964.
It reprints the cover and story from DC Comics' Metal Men 4 (1963):
"Bracelet of Doomed Heroes!"
32 pages, glossy colour cover, black and white newsprint interior.
Here is the cover of issue 4 and DC Comics' original cover:
Mimosa Metal Men Series