CGC Qualified (Green Label)
A Qualified label is used by CGC for certified books that have a significant defect that needs specific description, or to note an unauthenticated signature (one which was not witnessed by CGC).For example, it would be a disservice to the seller and buyer to call a VF/NM book with a 4-inch back cover tear a VG, so CGC will give this book a Qualified grade of "VF/NM 9.0, back cover 4-inch tear." Or, if the book is signed on the cover it may be noted as "Name Written on Cover."
In the case of Golden Age comics, many collectors may not know that they have submitted an incomplete book for grading (due to odd page counts in such vintage books), and are dismayed to find the book returned bearing the Green label.