Issued circa 1948-49, the cards in this set derive their name from the distinctive blue coloring used to tint the black-and-white photos. The cards have blank backs and measure 2" X 2-5/8". The set has a high percentage of New York players and was originally issued in strips of six or eight cards each and therefore would have been more appropriately cataloged as a "W" strip card set. The set includes several major variations of team designations, black-and-white rather than blue printing, and cards which can be found either with or without numbers. Proof cards have been found with printing on the back indicating they were photographed by Al Weinstein of Brooklyn. Giants manager Leo Durocher is pictured on the card above graded EX by PSA.