Design and striking For the purposes of the award referred to in subsection (a), the Secretary of the Treasury shall strike the gold medal with suitable emblems, devices, and inscriptions, to be determined by the Secretary. (c) Smithsonian Institution (1) In general Following the award of the gold medal under subsection (a), the gold medal shall be given to the Smithsonian Institution, where it will be displayed as appropriate and made available for research. (2) Sense of Congress It is the sense of Congress that the Smithsonian Institution should make the gold medal received under this Act available for display elsewhere, particularly at other locations and events associated with the Harlem Hellfighters. 4. Duplicate medals Under such regulations as the Secretary of the Treasury may prescribe, the Secretary may strike and sell duplicates in bronze of the gold medal struck under section 3(b), at a price sufficient to cover the costs of the medals, including labor, materials, dies, use of machinery, and overhead expenses. 5. Status of medals Medals struck pursuant to this Act are national medals for purposes of chapter 51 of title 31, United States Code.