Informal grade guide:New- Just that, in the original packaging, with all the correct paperworkNew(OTHER)- Usually unused, in complete original packaging, with instructions.
Mint, Mint(+,++)- Previously owned and used, but in perfect cosmetic and functional condition.
Mint(-)- Lower range of the mint. Shows few minor marks.
Xc plus- Between Mint and Excellent.
Excellent- Light signs of use. Might have slight marks and/or dings on finish,
typically on corners. Glass very clean, but may show minor cleaning
marks.
Xc minus- Between Excellent and Good.
Good- Shows average wear. May have slight ding
Fair- Shows much more than average wear. May have dents, dings and good amount of finish loss, but is generally fully functional.