Here's three thousand words (plus some extra).
See how the color is broken, and you see the white?
(This is some serious creasing here too. There's a lot of 'em.)Spine Stress:
See how it looks more like just a "pinch" or "dent" or "bend" that did not really break the color? Just a little stress on the spine.
There are two of them here.
I see 1 or 2 spine stresses on brand-spanking new comics.Subscription Crease:
That vertical line, just to the right of center, on the right of the "N" in "IRON".
Very bad for the comic.
Read what the others wrote here, and compare with these pics.
Thanks to www.E-Bigs.net
for the pics.
Someone should post full comic examples, like how an 8.0 looks or a comic with a subscription crease and what grade it would get if the comic was otherwise a 7.0. Just a thought.