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Mailing Standards of the United States Postal Service, International Mail Manual >
1 International Mail Services > 130 Mailability > 137 Firearms, Knives, and Sharp Instruments
Some knives and sharp instruments (see Publication 52, subchapter 44 and part 633) may be mailed to certain countries under the conditions specified in the Individual Country Listings. See 540 for U.S. Department of State licensing requirements applicable to the international mailing of arms or implements of war, component parts, and related technical data.