EXCELLENT: As good as new. Clean and damage free. No noticeable dings, dents or soiled areas.
VERY GOOD: Nearly new. May have subtle dents or dings that are insignificant or easily mitigated. There may be gently soiled areas that can be cleaned if needed or are otherwise unobtrusive.
GOOD: Lightly lived in. Has some combination of dents/dings or scratches some of which may be repaired and some not. May have some soiled areas that can be cleaned.
FAIR: Lived a good life. Bears the patina of age and shows some of the wear and tear of being used. Repairs or touch ups of dents, dings and soiled areas may or may not be viable, but still has a lot to offer.