For more than 45 years, the Exhibit Supply Company of Chicago produced postcard-sized photo cards for penny arcade machines. And what makes a set? Good question… Exhibit cards, or arcade cards, have been around for years and have featured some of the greatest athletes who have ever lived. They have always been a little special. Exhibits were not issued with gum, tobacco, marbles, cereal, dog food or any other product. Even without a product, you got more out of your penny from a card machine in an arcade than you would from any other machine. However, the cards were large,…