This set includes every common 2 letter prefix, every common 3 letter prefix (Lawson/Bouey and Crow/Bouey signatures), every changeover note, every asterisk replacement, every X replacement, every test note, and every steel and lithograph variety. The two notes I'm missing are *FB and *MD asterisk replacements. The red book is all asterisk replacements, the middle book is all 2 letter prefixes, and the last book is all 3 letter prefixes.
About 80% of this set is various grades of UNC. 19% are AU and 1% are EF (I keep my eye out to upgrade the several EF's).
Someday I hope to complete this set, if I'm able. Collecting is so satisfying!
Please enjoy!