Silver coins are graded based on their physical condition. Generally, coins can be classified into two distinct categories: circulated and un-circulated. The American Numismatics Association (ANA) recognizes 11 different grades for circulated coins, ranging from AG-3 at the bottom of the scale to AU-58 at the top.
MS-70 - This is the highest value for any coin- Mint State Perfect Un-circulated. You would not find a coin like this in circulation.
MS-60 - Un-circulated
AU-50 - About Un-circulated
EF-40 - Extremely Fine
VF-20 - Very Fine Sometimes you will see a + sign front of it, meaning “greater than” like this, +VF-20
VG-8 - Very Good
G-4 - Good
AG-3 - About Good - This is like junk silver coins.