On sale date from the publication date and the volume number found at the Catalog of Copyright Entries, Part 2, Periodicals, New Series, Volume 35, 1940, Number 2. Second class permit. Copyright number 447095.
Powell's full name is Stanley Robert Powell.
Script credit courtesy of the Who's Who.
The last half of page 8 is a house advertisement, making available the first 50 issues of Mystery Men Comics at the cost of 10 issues for 25 cents!