Official DC fanzine, published by DC. Mostly articles about DC characters and their creators.
According to an ad in Warlord #6 it was available for mailing February 1, 1977.
This as an unused cover for Justice League of America (DC, 1960 series) #66. Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (added by Gregory Fischer, May 2009).
On the back cover.