These 2-1/2" x 3-1/2" cards were the first since the All-Star sets of 1951 to be die-cut. This made it possible for a folded card to stand on display. The 77-cards in the set feature color photographs of the player with yellow and green backgrounds. Dirrections for folding are on the yellow top background, and when folded only the green background remains. Of the 77 cards, 55 were double-printed while 22 were single-printed, making them twice as scarce. - 2006 Standard Catalog of Basbeball Cards, 15th Edition.
None of the Twins cards were single-printed.