On sale date from the publication date reported to the U.S. Copyright Office found in the Catalog of Copyright Entries, Third Series, Volume 15, Part 2, Number 2, Periodicals, July-December 1961. Class B periodical. Copyright registration number B923753.
Jack Kirby pencils and possible inks per Nick Caputo via the error list (01/27/2005) and based on further research per his blog:
Possible Kirby inks seconded by JVJ (09/01/2015)
Timely/Atlas list originally credited Vince Colletta with inks.
Previous indexer guessed Colletta as penciler.