PRISON BREAK, April 1952 - Vol. 1, No.3. Published quarterly by REALISTIC COMICS, INC., 575 Madison Avenue, New York 22, N.Y. Jos. Meyers, Pres., Sol Cohen, Editor and General Manager. Indexed from a scan from http://goldenagecomics.co.uk/.
On inside front cover.
Machine-Gun Madman is in all lower case letters in the title.