27 C.F.R. § 26.106 Marking containers of beer.
Title 27 - Alcohol, Tobacco Products and Firearms
Containers of beer of Puerto Rican manufacture which are to be shipped to the United States must be marked with the name of the brewer; the serial number, capacity, and size of the container; the kind of beer; and the serial number of the withdrawal permit, Form 487B, prefixed by the number of such form, e.g., “487B–61–3.”
Title 27: Alcohol, Tobacco and Firearms
PART 26—LIQUORS AND ARTICLES FROM PUERTO RICO AND THE VIRGIN ISLANDS
Subpart E—Taxpayment of Liquors and Articles in Puerto Rico
Beer
§ 26.106 Marking containers of beer.