Possible arrival date based on front cover stamp of indexer's copy.
Conflicting credits; Steve Ditko per (Bob Bailey, 2005-03-19 & Nick Caputo 2006-08-31); Jack Kirby (Nick Caputo, 2005-01-05) (Per Sandell ed.) // Inker comment by Bob Bailey: While he was not well known for doing war comics Ditko did do a few. If you compare the inking on the cover to Sgt Fury #14 which was inked by Ditko over Ayers (or any of his other Kirby-Ditko collaborations i.e FF 14 cover, FF 13 interior) you get the same effect in the muscles, clothing, sand, water and Dum-Dum's hand. Also Nick Fury's rounded shoulder and facial wrinkles are definite Ditko.
Per Caputo: I've read Bob Bailey's comments about Ditko being the inker for this cover,and I have to admit that I suspected him as well, although I'm not entirely convinced. There were times that Ditko basically went over Kirby's lines instead of embellishing them, as he usually did (A Giant-Man story and Strange Tales Annual 2 are two instances), so its possible the sparse line I see in Kirby's inking may be Ditko following the lines.
Original indexer credited Dick Ayers.
House ad for The Avengers (Marvel, 1963 series) #1 (September 1963), with cover shown, and advertised as "Now On Sale". Located between story pages 5 and 6.
House ad for Fantastic Four Annual (Marvel, 1963 Series) #1 (1963); and Strange Tales Annual (Marvel, 1962 Series) #2 (1963), with covers shown. Ad also reveals the masthead logo from The X-Men comic. Located between story pages 18 and 19.
credits per Nick Caputo, March 2013.