I think it was for the old X-Men Classic series! Check out the unpublished site at the link above.
Saturday, March 29, 2014
I came across a neat blog the other day called unpublishedxmen.blogspot.com. Illustrations and commissioned drawings of X-men art. Some inventory art, some foreign covers! I enjoyed looking at his site and thought about the X-men art I have. Here is a repost of an unpublished sketch drawn by Art Adams.