This is a print from the 18th edition (April 1974).
Top left is a Mao quotation:
Everything that can be done should be encouraged: gymnastics, ball games, running, mountain climbing, swimming, taiji, and all kinds of sports (凡能做到的,都要提倡,做体操,打球类,跑跑步, 爬山,游水,打太极拳及各种各色的体育运动).