Bob Klein, Gene Reed, Bob Hughes, and Mike Tiefenbacher credit pencils and inks to Dick Dillin and Sheldon Moldoff. Craig Delich and Pat Lang credit pencils and inks to Jim Mooney and Sheldon Moldoff.
Letters credit from Todd Klein via his Klein Letters blog (18 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-1/).
Klein/Reed say Paris inks. Current credits from Pat Lang and Craig Delich February 2005.
First and only appearance of the 2nd Crimson Avenger. His predecessor (Lee Walter Travis) debuted in Detective Comics (DC, 1937 series) #20. Interestingly, Crimson Avenger 2 states that he has taken the name of a former lawman, (presumably the 1930's version).
Writer credit from Showcase Presents Green Arrow.
Statement of Ownership for October 1, 1962. Average paid circulation for the last 12 months was 420,000. Published by National Periodical Publications. Editor: Jack Schiff. Owners: "National Periodical Publications, Inc., Harry Donenfeld, Irwin Donenfeld, Sonia Iger, J. S. Liebowits, P. H. Sampliner, S. U. Sampliner, Harry Donenfeld Foundation, Inc. (a non stock corp., Irwin Donenfeld, Pres., J. S. Liebowitz, Sec'y), all at 575 Lexington Avenue, New York 22, N.Y."