Action Comics #241 published by DC Comics in 1958. Huge key featuring the debut of Superman's Fortress of Solitude. Such a huge key, there's even a key featured on the iconic cover by Curt Swan.
GD condition, complete and intact with everything attached. Spine reinforced with tape, both staples present. Centerfold and all pages attached. See hi res scans.
I am not a professional grader so please refer to the pictures.
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