A key issue in the Ditko run. This introduces both Clea and The Dread Dormammu. The latter had a blue flaming head in his debut, which was later changed to red.
INSIDE FRONT COVER
Inside front cover: A montage of Clea images. Upper left: Gene Colan sketch. Upper right: Sutton illustration from the back of the Doctor Strange Pocket Novel #2. Lower left: Bruce Timm sketch from his "Women of Marvel" print. Lower right: Cover by Abrams from Comic Reader #195.
INSIDE BACK COVER
Inside back cover: Dormammu montage. Top: From the Michael Golden portfolio. Bottom: From the Marvel Postcard Book.
I always use the original back cover on the customs.