Last update: 26 November 2023
G, VG, F, VF, XF, AU and UNC are grades, signifying how a particular coin, banknote or piece of exonumia is worn and how much of the original details remain. Those letters are abbreviations for:
There are also lesser grades, not represented on Numista:
On Numista item pages, you can also encounter Proof and BU (Brilliant Uncirculated) coins, banknotes or pieces of exonumia. Both are made a little differently from standard coinage or production. Details can differ from mint to mint for both.
You can read more about the grading of these type of items on Wikipedia: