NM = A nearly perfect copy that looks brand new with only a few very minor defects. Acceptable minor defects on a NM copy include: a very small amount of spine stresses, very minor instances of denting (two or three at most), slight corner blunting, and minor (less than 1/8") bends without color breaks
On the ten-point comic grading scale, a lower grade like 9.2 allows for such defects in a greater quantity and degree than a higher grade like a CGC 9.8, which sometimes may have no apparent defects at all
Acceptable minor defects on a NM copy include: a small amount of spine stresses, a few minor denting instances (two or three), slight corner blunting, and minor (less than 1/8") bends/tics with no color breaks