This back cover however, was attached to an original copy of Detective Comics #27 (CGC certification # 0079529001). The item "Detective Comics #27 (May 1939) CBCS Original Back Cover (1st app. Of Batman)" is in sale since Saturday, June 15, 2019. This item is in the category "Collectibles\Comics\Golden Age (1938-55)\Superhero".The seller is "comic$relief" and is located in Torrington, Connecticut. This item can be shipped to United States.