Dragon Magazine #138 (from October, 1988).  Features a stunning horror cover in honor of Halloween by Jeff Easley and is signed by Easley as well as Larry Elmore (the issue features the 62nd installment of his fan-favorite SnarfQuest comic strip).  It is graded by CGC and is part of their special Signature Series.  With Signature Series books a certified witness actually observes the signing of the comic and then immediately takes possession of the book so there is no possibility of the real autograph being switched out with another. It will be shipped with the utmost care.  Images include the front and back of the actual book as well as scans from a loose copy of the content page to show what the issue features (as the CGC case encapsulates the magazine and is designed so it cannot be opened and resealed).  

About Dragon Magazine:

Beginning in 1976, Dragon Magazine was in continuous publication for 31 years, its last issue hitting newsstands in September of 2007.  Generations of RPG gamers turned to Dragon not only as a source for industry news but new rules, characters, monsters, spells, magic items, campaign settings, and more.  It also featured short fiction from the industries most acclaimed writers (indeed, before the epic Dragonlance series hit bookstores, the main characters of the chronicles were introduced in the pages of Dragon in a series of short stories).  Though primarily focusing on the fantasy worlds of Dungeons and Dragons, the magazine also included sci-fi, super hero, and other RPG games.  It even included humor - from the eagerly awaited annual April Fool's issue to comic strips like Knights of the Dinner Table, Fineous Fingers, What’s New with Phil & Dixie, Wormy, and, of course, the hugely popular SnarfQuest by acclaimed fantasy illustrator Larry Elmore.  Which brings us to the gorgeous covers and interior art; in addition to Snarf, Elmore provided numerous covers and interior illustrations during the magazines run as did many other of TSR’s greatest illustrators; Clyde Caldwell, Jeff Easley, Fred Fields, Keith Parkinson, Daniel Horne, and Brom, among many others. There was, put simply, something for everyone interested in RPG gaming. Though the magazine is no more- it nevertheless remains the single greatest RPG publication in the genera’s history. 

About CGC: 

The Certified Guaranty Company (CGC) is the world's preeminent third-party grading service for pop culture collectibles, including comic books, trading cards, magazines, concert posters, coins, and more.  They have graded millions of collectibles, authenticated hundreds of thousands of autographs through their distinguished Signature Series Program, and were the first independent and impartial third party grading service for comic books.