The X-Men 1963 #40 - 4.5 - $75.00
On-sale date from 1968 Periodicals, Copyright Office, Library of Congress.
- The Mark of the Monster! - Professor X secretly replaced by Changeling through issue #43.
- Face Front! Hang Loose! 'Nuff Said! - Stan's Soapbox, Items, The Mighty Marvel Checklist.
- - Letters from: Robert Thuotte, Doug Nikkel, Lewis Flock, Jon Ray, Connie Sheehand, Richard Struempler, and Ken Jensen.
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