This issue has variants.
The on-sale date is the publication date reported in the U. S. Copyright Office filing.
Spine notes this is a "Marvel Treasury Special".
Inside front cover includes art by Kirby and additional credits, including Archie Goodwin and Marv Wolfman, consulting editors; Lenny Grow and Jim Novak, Staff and such; Dave Kraft, photos and features; John Costanza, lettering and Jack Kirby and Marie Severin, coloring.
adapted from 2001: A SPACE ODYSSEY (1967, MGM), based on "The Sentinel" by Arthur C. Clarke; cont'd in 2001: A SPACE ODYSSEY #1
an overview of the novel and observations on the film includes stills from the movie.
Inside back cover includes a brief bio of Jack Kirby with a photo of him at his drawing board, the credits to the movie and background artwork.