Bingo Cards were made out of leather so that they could be reused
In the 1930s the Butchers Social Union found themselves faced with a mystery. Their leather bingo cards kept going missing. One day someone noticed that bingo players were stealing the cards to patch holes in their shoes. So the Union decided to stamp several holes in the cards, thus foiling the thieves.
With thanks to Séamus Marken
Watch a video about Ireland in the 1930’s meant for an American audience: