From what I can tell, charlton has taken the unc value in the old book and called it unc60 in the new book for scarcer notes/prefixes, with prices higher for premium unc notes, this is how it's been anyway.
For easier notes, the old UNC price now becomes the UNC63 price, with unc60 a little lower, and unc65 a little higer. This is how it's been anyway.
For really easy notes, the old unc price is now the gem price, and lesser uncs discounted, this is also how it's been.
Seems to make sense. now it's just a matter of arguing which unc the note is, this is how it's always been.