Each is a 7/8" litho featuring a King Feature Syndicate character. Each button carries a copyright symbol but no other text. c. late 1950s. Of the 39 known these are 24 different. Major characters include Dale Arden, Flash Gordon, Prince Valiant, Lothar of Mandrake The Magician, plus numerous characters in the Katzenjammer, Popeye, and Snuffy Smith families. In this group only Wimpy shows noticeable paint wear. The rest are Exc. to Mint. Numerous scarce buttons included.