The 55 cards (fronts only) from the 1966 Topps Chewing Gum Batman set. Information from www.oldbubblegumcards.com:
Batman Series 1 - known to bubblegum trading card collectors as Batman Orange Backs or Black Bats, has a total of 55 cards in the set. Each card is a full color hand-painted image by several artists, the majority by pulp cover veteran Norm Saunders (Mars Attacks) and from pencil drawings by Golden Age comics artist Bob Powell. The verso features a short storyline that follows the illustration.