No person shall sell, expose or offer for sale, or transport for sale, potatoes in open or closed packages, except for delivery to processing plants, packing houses, or to a storage for packing, unless:
(a) Each such package bears conspicuously in plain words and figures, on the outside, or on a durable insert, or stuffer within, which is readily readable from the outside, or on a tag firmly affixed to the package--(1) the word "potatoes," (2) the grade, (3) the net quantity in weight, measure or numerical count, and (4) the name and address of the person under whose authority the potatoes were packed.
(b) The potatoes in each such package conform to the markings on or within such package in every particular.
(c) The shown face or shown surface reasonably represents the entire contents of the package.
Potatoes in open or closed packages not graded in conformity with any of the U.S. Standard grades may be exposed, offered or transported for sale or sold as "Unclassified" or "Culls" if so marked in a conspicuous manner.