It shall be deemed unlawful under any condition to sell, under or by reference to any United States Standard for naval stores, as provided by the act and defined in the regulations in this part, any article which fails to conform with such standard in all respects: Provided, That the phrase “under or by reference to United States Standards” as it appears in the act and the regulations in this part, shall include the use of any words, letters, brands, labels, or marks constituting any of the United States Standards for naval stores on any container of naval stores, on anything attached to or supplied therewith on delivery, or on any inspection, sale, or shipping record or invoice, in describing the kind, classification, or grade of the naval stores covered thereby.