Teenage Mutant Ninja Turtles (2011) #100 CGC NM/M 9.8 SS Eastman. SIGNED & SKETCH BY KEVIN EASTMAN ON 12/15/21. All uncertified books are graded to current market standards, taking into account what we know of CGC grading and Overstreet's Grading Standards. Our graders have over 20 years of grading experience each. We do occassionally miss a defect on a book.