This is Amazing Stories for July 1927, cover by Frank R. Paul. The ISFDB entry for this issue is here. I found this cover at Pulp Covers. Unfortunately there doesn’t seem to be a copy of this issue in the Internet Archive. One remarkable detail from this early cover (at the top, middle) is the call sign of WRNY, an AM radio station in New York started by editor Hugo Gernsback to promote the magazine. WRNY was a very early (1928) experimenter with television broadcasting and also had a shortwave affiliate sometimes heard across the globe.