Over the last few years I've done a series of submissions of 9.8 prescreens of my personal books, purchased new, from the '90s.
Today, I found a small stockpile of prescreen rejected, raw books that I had yet to open.
As I inspected them I spent more time looking at the CGC printed label associated with each. Aside from barcode, identification number and printed title of book I noticed each had a hand-written number or series of numbers. For example, 6, 8, 12 or 6 & 8.
My first thought, given consistency, was that this is a code that denotes the representative defect. If so and that is existing information published by CGC or forum and I missed, shame on me. Second thought was that the 6, 8 or 12 is associated with grader.
If code does denote defect would be great to be able to associate with book to understand max grade potential.