Oppo, a game of opposites, was published by Jaques c.1920s. Each player takes a letter card A, B, C or D and is known by that letter during the game. The object of the game is to call out “Oppo AB” or “Oppo BC” (as the case may be) as cards are played out on the table. This example has the box and the rules and is complete with 64 cards.