All you had to do was ask The GR number (Graham-Reiver) is like the Overton number for the lettered edge varieties. I've been told the book itself is quite rare now, and hard to find.
I guessed AU55 before I read the reveal. The hairlines look irregular enough to not be attributed to a cleaning, but distracting enough to knock it down a grade.
Nice coin!. I make it GR-13 (Obverse 10 and Reverse K) and later die state. Reverse K was also used later with Obverse 11 to make GR-14.
I've never seen it offered as a PDF. The dealer David Kahn was selling these (he works a lot with Dick Graham). He might have more info, or be able to point you in the right direction? I know you can find these sometimes at used coin-book-sellers, but I haven't really looked recently.
https://www.davidkahnrarecoins.com/...ge-half-dollars-1836-1839-by-dick-graham.html Devilishly hard to lay a hand upon.........glad I got my copy back in the day.