This issue has variants.
The on-sale date is the publication date reported in the U. S. Copyright Office filings.
Corner symbol box invented by Steve Ditko (as revealed in the letters page of Fantastic Four # 19) begins with this issue.
Letters from Stewart Scheifer, Bill Hauptman, David Languth, Victor Phillips, Lee Whittlesey, Jeffrey Roy Pontello, Mark Savage, Katheleen McCoy,Joseph Shoemaker, Richard Eilts, Kevin Johnson, Jim Broeker, Arthur Davis, Jr., and Barry Goldstein; replies to letters by Stan Lee. Includes Invisible Girl illo from an earlier issue and Special Announcement Time!