15 U.S. Code § 295 - Standard of fineness of gold articles; deviation
In the case of articles of merchandise made in whole or in part of gold or of 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 such gold or alloy shall not be less by more than three one-thousandth parts than the fineness indicated by the mark 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:
1976—Pub. L. 94–450 substituted “three one-thousandth parts” for “one-half of one carat”, “in an article mentioned in this section” for “in such article”, “than three one-thousandth parts, in the case of a watchcase or flatware, or than seven one-thousandth parts, in the case of any other such article,” for “than one carat”, struck out “in the case of any article mentioned in this section” which followed “
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