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 448974.
Last "generic" cover. Cover credits from Sheldon Moldoff himself in Alter Ego #52 (September 2005). Art originally tentatively credited to Creig Flessel.
Oddity: A detective questioning Rex Tyler about Miss Drew, inquires of him as to whether or not he is "Tick-Tock Tyler, The Hour-Man"! Letterer credit added by Craig Delich 2008-2-10. Writer revision from Gardner Fox to Fitch by Craig Delich and verified by Martin O'Hearn 2009-4-18.
Credits updated 11/04 by Bob Hughes, art identification by Craig Delich. Art credits in Archives are wrong.
On page 5, panel 2, the door has lettering for this story's writer, G. Fox.
The last panel of the story, on page 10, has two mysterious interlocked initials, apparently an "F" over a "C". May be for Fox (writer) and Chad (artist).