From the Red Book Guide book of United States Coins
ANA Grading System Grading Scale goes from 1-70
About Good (AG-3), Good (G-4), Very Good (VG-8), Fine (F-12), Very Fine (VF-20),
Choice Very Fine (VF-30), Extremely Fine (EF-40), Choice Extremely Fine (EF-45),
About Uncirculated (AU-50), Choice About Uncirculated (AU-55),

Mint State: Uncirculated (MS-60). Choice Uncirculated (MS-63), Gem Uncirculated (MS-65)
Perfect Uncirculated (MS-70)

Proof: Proof (PF60), Choice Proof (PF63), Gem Proof (PF-65)