I don't participate in grading anything I haven't owned and I compare so many to the AF15 I had which was a 5.0. I also had an ASM 16 graded at 9.2. So i look to those books and the hundreds I owned which were never slabbed but were really nice. So, When I look at this book, the major flaw is the deterioration occurring on the right hand cover. I suspect it was stored poorly. The paper seems to actually be disintegrating and I have that on a JIM 84 here This however is really good. The spine is great, the color vibrant. no real color breaks at all. It's significantly nicer that the AF15 was and would be higher in my mind if not for the right hand side. CGC tends to be more forgiving of older books and this is an older book. 5.0, 5.5 makes little sense to me. I'm still up in the 7.0+ range. I'll be interested in the CGC grade.