It shall be unlawful for any person, partnership, association, or corporation engaged in commerce among the several States, Territories, District of Columbia, and possessions of the United States, or with any foreign country, to stamp any gold, silver, or goods manufactured therefrom, and which are intended and used in such commerce, with the words “United States assay”, or with any words, phrases, or devices calculated to convey the impression that the United States Government has certified to the fineness or quality of such gold or silver, or of the gold or silver contained in any of the goods manufactured therefrom. Each and every such stamp shall constitute a separate offense.

Any gold, silver, or goods manufactured therefrom after February 21, 1905, bearing any of the stamps, words, phrases, or devices prohibited to be used under section 291 of this title, and being in the course of transportation from one State to another, or to or from a Territory, the District of Columbia, or possessions of the United States, shall be forfeited to the United States, and may be seized and condemned by like proceedings as those provided by law for the forfeiture, seizure, and condemnation of property imported into the United States contrary to law.

Every person, partnership, association, or corporation violating the provisions of sections 291 to 293 of this title, and every officer, director, or managing agent of such partnership, association, or corporation having knowledge of such violation and directly participating in such violation or consenting thereto, shall be deemed guilty of a misdemeanor, and, upon conviction, be punished with a fine of not more than $5,000 or imprisonment for not more than one year, or both, at the discretion of the court.

It shall be unlawful for any person, firm, corporation, or association, being a manufacturer of or wholesale or retail dealer in gold or silver jewelry or gold ware, silver goods or silverware, or for any officer, manager, director, or agent of such firm, corporation, or association to import or export or cause to be imported into or exported from the United States for the purpose of selling or disposing of the same, or to deposit or cause to be deposited in the United States mails for transmission thereby, or to deliver or cause to be delivered to any common carrier for transportation from one State, Territory, or possession of the United States, or the District of Columbia, to any other State, Territory, or possession of the United States, or to said District, in interstate commerce, or to transport or cause to be transported from one State, Territory, or possession of the United States, or from the District of Columbia, to any other State, Territory, or possession of the United States, or to said District, in interstate commerce, any article of merchandise manufactured after June 13, 1907, and made in whole or in part of gold or silver, or any alloy of either of said metals, and having stamped, branded, engraved, or printed thereon, or upon any tag, card, or label attached thereto, or upon any box, package, cover, or wrapper in which said article is incased or inclosed, any mark or word indicating or designed or intended to indicate that the gold or silver or alloy of either of said metals in such article is of a greater degree of fineness than the actual fineness or quality of such gold, silver, or alloy, according to the standards and subject to the qualifications set forth in sections 295 and 296 of this title.

In the case of articles of merchandise made in whole or in part of silver or any of its alloys so imported into or exported from the United States, or so deposited in the United States mails for transmission, or so delivered for transportation to any common carrier, or so transported or caused to be transported as specified in section 294 of this title, the actual fineness of the silver or alloy thereof of which such article is wholly or partly composed shall not be less by more than four one-thousandth parts than the actual fineness indicated by any mark (other than the word “sterling” or the word “coin”) stamped, branded, engraved, or printed upon any part of such article, or upon any tag, card, or label attached thereto, or upon any box, package, cover, or wrapper in which such article is incased or inclosed; and that no such article or tag, card, or label attached thereto, or box, package, cover, or wrapper in which such article is incased or inclosed shall be marked, stamped, branded, engraved, or printed with the word “sterling” or “sterling silver” or any colorable imitation thereof, unless such article or parts thereof purporting to be silver contains nine hundred and twenty-five one-thousandth parts pure silver; and that no such article, tag, card, label, box, package, cover, or wrapper shall be marked, stamped, branded, engraved, or printed with the words “coin” or “coin silver” or colorable imitation thereof unless such article or parts thereof purporting to be silver contains nine hundred one-thousandth parts pure silver: Provided, That in the case of all such articles whose fineness is indicated by the word “sterling” or the word “coin” there shall be allowed a divergence in the fineness of four one-thousandth parts from the foregoing standards: Provided, That in any test for the ascertainment of the fineness of any such article mentioned in this section according to the foregoing standards the part of the article taken for the test, analysis, or assay shall be such part or portion as does not contain or have attached thereto any solder or alloy of inferior fineness used for brazing or uniting the parts of such article: Provided further, That in the case of any article mentioned in this section, in addition to the foregoing tests and standards, the actual fineness of the entire quantity of silver or of its alloys contained in such article, including all solder and alloy of inferior fineness used for brazing or uniting the parts of such article (all such silver, alloys, and solder being assayed as one piece), shall not be less by more than ten one-thousandth parts than the fineness indicated by the mark stamped, branded, engraved, or imprinted upon such article, or upon any tag, card, or label attached thereto, or upon any box, package, cover, or wrapper in which such article is incased or inclosed, it being intended that the standards of fineness and the tests or methods for ascertaining the same provided in this section for articles mentioned therein shall be concurrent and not alternative.

All articles of merchandise to which sections 294 to 300 of this title apply which shall have been transported into any State, Territory, District, or possession of the United States, and shall remain therein for use, sale, or storage, shall, upon arrival in such State, Territory, District, or possession, be subject to the operation of all the laws of such State, Territory, District, or possession of the United States to the same extent and in the same manner as though such articles of merchandise had been produced in such State, Territory, District, or possession, and shall not be exempt therefrom by reason of being introduced therein in original packages or otherwise.