About the item:  

Action Comics #521, signed by hand by Superman story writer Gerry Conway as well as by the Aquaman backup story team Bob Rozakis (writer) and Alex Saviuk (artist). It is JSA authenticated through CGC with a grade of 7.0. Features the first appearance of Vixen, who would go on to join the JLA a few years later.  Fresh from CGC, it will be shipped with the utmost care.