Video: Rare baseball cards worth millions found in Ohio attic Karl Kissner found hundreds of the rare collectables wrapped in twine in the box, which was under a wooden dollhouse. As he picked through the cards, which were smaller in shape than today's cards, he found some with the names of American baseball greats such as Ty Cobb, Cy Young and Honus Wagner. The cards are from an extremely rare series issued around 1910. Up to now, the few card form that era known to exist were not in very good condition, with faded images and worn edges. But the ones from the attic in the town of Defiance are nearly pristine, untouched for more than a century. The colours are vibrant, the borders crisp and white. Kissner and his family said the cards belonged to their grandfather, Carl Hench, who died in the 1940s. "Our best guess and it is a guess is our grandfather had a meat market, just two blocks down and he had other miscellaneous grocery items, our best guess is that he probably was giving them away as a promotion and these are the cards they didn't give away, he stuck them in a box and put them in the attic," Mr Kissner said. The best of the bunch - 37 cards - are expected to bring a total of $500,000 (£321,840) when they are sold at auction in August during the National Sports Collectors Convention in Baltimore. They include such stars as Christy Mathewson and Connie Mack.