Here it’s shown in use on two posters for The Olympics in Mexico (Spanish: Olimpiada en México), a documentary film directed by Alberto Isaac (1923–1998) who himself competed as swimmer in two Olympics. The film can be watched on the website of the IOC:
The high altitude of Mexico City, allied to the political and social upheavals of the time in Mexico itself, meant that the Summer Olympics of 1968 were the most controversial of modern times. But Alberto Isaac recorded so many events with a rare command of sound and image that his film received an Academy Award nomination for best documentary. Among the highlights are Bob Beamon’s prodigious leap in the long jump, Debbie Meyer’s triumphs in the swimming pool, and Dick Fosbury’s revolutionary “flop” technique in the high jump. There is superb coverage of the water polo, as well as of the diving competitions.