This cube does have a noticeable stress mark on the white/green/blue corner, but this does not affect the use of the cube.
The rest of the cube has visible stickerless surface scratches but smooth turning and is a pleasure to solve with.
What do the different grades mean?
A = As good as new (minor marks/maybe 1 or 2 very small marks/chips on stickers)
B = Couple of minor marks/chips on stickers/needs setting up/over lubed
C = Could do with new stickers all round