[Can. Transit] for use on railroad cars, and "United States-Canada Customs" for use on samples. Uncolored seals used for Customs purposes other than for (1) shipping in bond, (2) shipping by other than a bonded common carrier in accordance with section 553, Tariff Act of 1930, as amended, or (3) shipping in transit shall be stamped "U.S. Customs." All seals (except uncolored in-transit seals on containers of commercial traveler's samples and seals for use on airline liquor kits) shall be stamped with the name of the port for which they are ordered. Each strap seal shall be stamped with a serial number. Each automatic metal seal shall be stamped with a symbol number and, when required, with a serial number.
19 C.F.R. §24.13
For FEDERAL REGISTER citations affecting §24.13, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.