The comic is an adaptation of the Jules Verne novel "L'Île mystérieuse [The Mysterious Island]" (1874).
The indicia states the title as Marvel Classics Comics Featuring The Mysterious Island.
The title page includes the credit "A Vincent Fago Production."
The on-sale date is the publication date reported in the U. S. Copyright Office filing.
Inside front cover.
Reprint information from John Haufe, CI Historian
Inside back cover.