2001: A Space Odyssey (MGM, 1968). Cinerama movie poster. Artist: Robert T. McCall. 
McCall had been commissioned by NASA to document the space program’s achievements, and so became a logical choice by MGM to design the campaign for 2001: A Space Odyssey. McCall did several posters for the film, but this is by far the rarest. This style C was only used in theaters presenting the film in Cinerama, and since not many theatres were set up for it, these posters were distributed in very small quantities. 
via ha.com

2001: A Space Odyssey (MGM, 1968). Cinerama movie poster. Artist: Robert T. McCall. 

McCall had been commissioned by NASA to document the space program’s achievements, and so became a logical choice by MGM to design the campaign for 2001: A Space Odyssey. McCall did several posters for the film, but this is by far the rarest. This style C was only used in theaters presenting the film in Cinerama, and since not many theatres were set up for it, these posters were distributed in very small quantities. 

via ha.com