decades ago, literally, I had a book similar to this that I sold to Richard Muchin. He had a concept that I think applies really well when thinking about how to grade something like this. Picture the average book in VG, FN, VF, etc., and imagine if you would rather have that book or this one. If you'd rather have a standard VF over this one, then this one isn't VF. If you'd rather have this one over a standard FN, then this one is nice than FN. That gives you a range where the book should grade. Obviously that's going to boil down to some personal preference, but in this case that missing corner would really bother me. I'd probably take a nice FN over this copy, so I'd mark this one as something like VGF. I don't know anyone in their right mind who would choose this over a VF, and 8.5 is silly.