(3) Exception for certain coins and bullion
For purposes of this subsection, the term “collectible” shall not include—
(A) any coin which is—
(i) a gold coin described in paragraph (7), (8), (9), or (10) of section 5112 (a) of title 31, United States Code,
(B) any gold, silver, platinum, or palladium bullion of a fineness equal to or exceeding the minimum fineness that a contract market (as described in section 7 of the Commodity Exchange Act, 7 U.S.C. 7)  requires for metals which may be delivered in satisfaction of a regulated futures contract,
if such bullion is in the physical possession of a trustee described under subsection (a) of this section.
(a) The Secretary of the Treasury may mint and issue only the following coins:
(6) except as provided under subsection (c) of this section, a one-cent coin that is 0.75 inch in diameter and weighs 3.11 grams.
(7) A fifty dollar gold coin that is 32.7 millimeters in diameter, weighs 33.931 grams, and contains one troy ounce of fine gold.
(8) A twenty-five dollar gold coin that is 27.0 millimeters in diameter, weighs 16.966 grams, and contains one-half troy ounce of fine gold.
(9) A ten dollar gold coin that is 22.0 millimeters in diameter, weighs 8.483 grams, and contains one-fourth troy ounce of fine gold.
(10) A five dollar gold coin that is 16.5 millimeters in diameter, weighs 3.393 grams, and contains one-tenth troy ounce of fine gold.
(11) A $50 gold coin that is of an appropriate size and thickness, as determined by the Secretary, weighs 1 ounce, and contains 99.99 percent pure gold.
(12) A $25 coin of an appropriate size and thickness, as determined by the Secretary, that weighs 1 troy ounce and contains .9995 fine palladium.
(e) Notwithstanding any other provision of law, the Secretary shall mint and issue, in qualities and quantities that the Secretary determines are sufficient to meet public demand, coins which—
(3) have a design—
(k) The Secretary may mint and issue platinum bullion coins and proof platinum coins in accordance with such specifications, designs, varieties, quantities, denominations, and inscriptions as the Secretary, in the Secretary’s discretion, may prescribe from time to time.