On sale date from the publication date reported to the U.S. Copyright Office found in the Catalog of Copyright Entries, Part 2, Periodicals, 1941, New Series, Volume 36, Number 4. Class B periodical. Copyright registration number B 524051.
This story eerily told of the bombing of Pearl Harbor.....and the magazine was cover dated December, 1941, even though the story was probably produced some six months in advance.
Writer credit changed from Gil Fox to Harry Stein from an interview Gil Fox gave Jim Amash, portion of which reprinted by Amash on the Comics History Exchange on Facebook (7 December 2016). Fox confirms Stein wrote the story. Fox also disputes Will Eisner's claim he had researched and suggested the idea.
Lance Blackwood, according to the Who's Who, is a by-line found on this strip (and the pen-name of early artist Dan Zolnerowich). Writer and art credits taken from the Who's Who and from the Quality Companion (TwoMorrows, 2011 series) #nn (November 2011). Added by Craig Delich (2013-7-20).