What do G, VG, F, VF, XF, AU and UNC mean? 

G, VG, F, VF, XF, AU and UNC are grades, signifying how a particular coin is worn and how much of the original details remain. Those letters are abbreviations for:

• G: Good
• VG: Very Good
• F: Fine
• VF: Very Fine
• XF: Extremely Fine
• AU: Almost Uncirculated
• UNC: Uncirculated

 

There are also lesser grades, not represented on Numista: 

• PO: Basal State or Poor
• Fr: Fair
• AG: About or Almost Good

 

On Numista coin pages, you can also encounter Proof and BU coins. Both are made a little differently from standard coinage. Details can differ from mint to mint for both. 

 

You can read more about coin grading on Wikipedia: https://en.wikipedia.org/wiki/Coin_grading