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. Class B periodical. Copyright number B 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!