Distributed to newstands in June 1964. This issue includes 10 pages of paid advertisements.
Distribution date from Joseph Marek's Marvel Comics Group history website.
Letters credit from George Olshevsky's Marvel Comics Index. Cover comprised of figures from interior story.
Black Widow last appears in issue #53 (May 1964), the Widow and Hawkeye next appear in issue #60 (December 1964).
Continues next issue. Printed between the pages of the Iron Man story. Below the story is a teaser for the next issue: "Iron Man Battles Captain America Next Issue! Don't Miss It!"