On sale date from the publication date found at the Catalog of Copyright Entries, Part 2, Periodicals, New Series, Volume 35, 1940, Number 2. Second class permit. Copyright number 451777.
Tony Rose believes that the cover has been heavily re-touched by Eisner but that at the very least, the Kaänga figure was penciled by someone else.
The depiction of Caredodo is an homage to Charles Laughton's portrayal of the hunchback, Quasimodo, in the 1939 film, "The Hunchback of Notre Dame."