Mint = new or as new. never opened or used in near perfect condition.
Ex+ = shows little or no sign of any wear and tear. Although it has been opened and used it is complete and intact. Almost new.
Ex = shows very minimum signs of ageing and wear and tear. Complete and intact.
VG+ = Better than VG. Signs of ageing and wear and tear and possible small edge nicks. Possible restoration. Complete and intact.
VG = Obviously shows signs of ageing and wear and tear. Possible small to large folds. Possible restoration.
Good = Possible overall quality deterioration. Obvious signs of ageing, wear and tear, folds and creasing. Possible paper/parts loss. Possible restoration.
Acceptable = Obvious paper or parts loss. Obvious damage, ageing, wear and tear, folds, tears, creasing. Possible foxing. Major restoration.
Poor = Large parts of the item are missing or badly damaged. Major restoration needed.