Dennis Denny O'Neil signed 1988 Superman Earth Stealers comic book graphic novel

1988 Superman the Earth Stealers comic book or graphic novel autographed in blue Sharpie on the cover by the late editor Dennis O'Neil, a prominent DC and Marvel comic book writer for decades. Obtained in person at San Diego Comic-Con many years ago, with certificate of authenticity from AutographsForSale.com. Comic book is in excellent condition. ONLY ONE AVAILABLE FOR SALE.