The date of release is noted in the letters page of Fantastic Four #600. It is confirmed by 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 B917811. Copyright given to Canam Publishers Sales Corp.
Timely-Atlas expert Michael Vassallo has examined hundreds of known Klein art and inking samples, as has Nick Caputo, and both agree that Klein is the inker of the cover. Mark Evanier also agrees on Klein's credit. Inkers originally cited as possibilities included Chris Rule and Dick Ayers (who has affirmed he did not ink the cover or interior).
Goldberg coloring credit disclosed in February 2011 http://www.comicbookresources.com/?page=article&id=31016 http://www.firstcomicsnews.com/?p=20698 and mentioned on Fantastic Four #600 letters page.
Logo design credit from Todd Klein and Mark Evanier from Klein's Facebook page, used by permission. Klein says generally early Marvel logos were designed by Brodsky and either inked or finished by Simek.
Characters added by Per Sandell (2005-12-05).
An entire facsimile issue including the front cover and complete story was reprinted (minus the ads) in Golden Book and Record Set # SLP-185 in 1966. Maximum Fantastic Four contains the full issue (with ads) as a poster.
Characters, synopsis: Added by Per Sandell (2005-12-05). Nick Caputo believes Sol Brodsky may have been involved in corrections throughout. In the letters page of issue #281 it states according to Roz and Jack Kirby, via Steve Leialoha, that it was Artie Simek who inked the first issue of FF and that Sol Brodsky started inking with issue #2.
Nick Caputo believes that Sol Brodsky may have been involved in corrections throughout.
Sequence added by Per Sandell (2005-12-05). Nick Caputo believes Sol Brodsky may have been involved in corrections throughout.