Potatoes, apples and peaches in closed packages, if not definitely marked as "unclassified" as hereinbefore provided, shall be marked in a plain and conspicuous manner with a statement of (1) the grade, (2) the contents in cubic measure or weight, (3) the name and address of the person or association under whose authority the potatoes, apples or peaches are packed.
In case the marking is changed the person making the same shall cancel the name and address included in the original marking and substitute therefor his own name and address.
31 P.S. § 373