Visual grading scale:
M = Mint. Flawless.
NM = Near Mint. One or two faint hairlines, marks, or light scuffs.
EX = Excellent. Some light paper scuffs or a few light hairlines.
VG = Very Good. Some scuffs or light scratches.
G = Good. Some mild scratches and scuffs.
F = Fair. Playable but not ideal; a lot of scratches or scuffs and general wear.
W = Worn. A filler copy with heavy wear and scratches.