The red and blue colors of the Thunderer's costume are reversed on this cover.
On the Timely-Atlas list, Dr. Michael J. Vassallo indicated that there might be a different inker on this story.
Previous appearance Red Raven Comics (Marvel, 1940 series) #1. Letterer credit added by Craig Delich 2010-4-26.
Dr. Michael J. Vassallo notes that this art looks different from the feature in the next issue which Sahle signed under his own name. He speculates the pen name "Jewell" indicated a collaboration with another artist.
Part one of an unfinished story. The Challenger's feature moved to Mystic Comics after this issue, but the second half of this text story did not appear there with it. The bottom half of page 2 features an illustrated ad for Captain America Comics #2.
First appearance. As shown in the next issue, the adventures of Captain Daring take place in the mid-31st century.
Note that the Captain Daring in USA Comics (Marvel, 1941 series) #7 is an entirely separate character.
Harry Mendryk attributes the art to Kirby alone at http://kirbymuseum.org/blogs/simonandkirby/archives/category/periods/timel…, while others have indicated inking by Simon.
Letters credit identified by Greg Theakston and later Harry Mendryk on the Jack Kirby Museum web page http://kirbymuseum.org/blogs/simonandkirby/archives/2369, 31 October 2008 (retrieved 15 December 2014).
Next appearance in Mystic Comics (Marvel, 1940 series) #6.
According to notes from Dr. Michael J. Vassallo on the Timely-Atlas list, Nicholas (then known as Wojtkoski) may have been assisted by an inker on this story. But contrary to the earlier GCD credit, the inker is not George Klein.