Marvel Masterworks volume 12 is a collection of issues #101-110 of the X-Men title.  The Marvel Masterworks series, which began in 1987, celebrates the early issues of the classic stories in a beautiful, collected editions.  These "new" X-Men issues ushered in the "Chris Claremont Era," which propelled this title to become even more popular and widely collected.  This book is in LIKE NEW, pristine condition, still sealed in its wrap from the printer.  It is a first printing.