The back of the Sadaharu Oh is a bit underwhelming! The Japanese writing simply says, "OUT!"
I'm assuming the cards doubled as a game, similar to how my friends and I used to play baseball with the Topps 1978 "Play Ball (Played by Two) cardbacks. most memorable to me for the Tony Armas UER featuring the outcome of STRIKE UT. (And ten points to anyone who from memory can name a player with an outcome of HOME RUN! I can't anymore, though Bobby Grich is in my head.)
oh_back.jpg armas.JPG