NY Comic Art Convention Advert - Jack Kirby (1976)

Art from Marvel's 2001 A Space Odyssey comic adaption which has been appropriated for a New York Comic Con advert but I'm not sure of the year  I've seen it dated as 1971 which is rubbish because we didn't know about Star Wars back then.  Logic says 1977.  Does any one know better?

based on info in the comments' section then I'll edit to 1976. Thank you

Steve

Captain America by Jack Kirby (1976)

Steve.