These cards which feature artist Mario DeMarco's drawings of Hall of Famers, were produced from 1950 through 1956 and sold by the Baseball Hall of Fame in Cooperstown and at major league ballparks. The cards measure 1-3/4" X 2-1/2" and include a detailed player biography on the back. When introduced in 1950 the set included all members of the Hall of Fame up to that time, and then new cards were added each year as more players were elected. Therefore, cards of players appearing in all previous editions are more common than those players who appeared in just one or two years. When the set was discontinued in 1956 it consisted of 82 cards, which is now a complete set. B.E. Callahan of Chicago, the publisher of "Who's Who in Baseball," produced the card set. MINT example of Morgan Bulkeley!