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The X-Men King-Size Special #1 from 1970 is a highly sought-after comic book featuring the first crossover between the X-Men and Avengers superhero teams. This special issue, with a larger size and the title "First X-Men," marks a significant milestone in the world of US Comics, as it brings together two iconic groups of superheroes for an exciting adventure. With artwork and writing by the famous King, this comic book is a must-have for any comic book collector looking to own a piece of comic book history.