Your copy looks nearly identical to mine, even down to the placement of the color-breaking spine tick and the slightly blunted corners/factory tears (however mine is qualified with "M. Wagner in writing on cover").
It received a 9.4. I broke it out a long time ago and recently pressed the only defect I could affect - slight creasing at the top edge - and maybe raised it +0.2.
Long explanation, but with only a few more small spine ticks than my copy, I'm sure you have a 9.2/9.4.
Congratulations!
I love this book. One of my Top 10.
Thanks for sharing!