Dennis (Denny) O'Neil autographed Superman The Earth Stealers comic book or graphic novel

Superman The Earth Stealers comic book or graphic novel autographed in blue marker on the cover by 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.