The game of Conkers (Historic UK) was once a very popular playground game and the link will take you to a 1967 photo from The Ousel, titled Conkering Heroes. The photo is part of a book of images called Portrait of Bedford School, published in 1967. You can find the book on the Bedford School Heritage site, under Books and Photo Books. Click here for login details. There is also a 1981 entry from the Inky Verse and Prose section.