I think perhaps you dont need anything related to the class anyway, like grannie says, 'home grown' says more about the care and quality, than an equivalent to an industrial standard does!
i only sell half a dozen a week if i have them, and i dont label the boxes at all. There bought by someone at my wifes work who also buys some from someone else in selby who has a few chucks on a lotty. Simply the fact that there good and fresh does it. A good reputation is worth more than a few words on a box.