This is an exceptional copy of the 1982 Detective Comics #521, signed by the writer Gerry Conway, and graded 9.8 Near Mint/Mint by the Certified Guaranty Company (CGC). The comic book features Green Arrow and Batman (Bruce Wayne) in the Bronze Age (1970-83) era of the DC Universe. It is part of the Justice League of America superhero team and published by DC Comics.

The collector's item comes with a publication year of 1982 and is classified under the categories of Collectibles, Comic Books & Memorabilia, Comics, and Comics & Graphic Novels. The series title is Detective Comics, and the tradition is US Comics. This item description provides valuable information for any comic book enthusiast looking to add this piece to their collection.