18 U.S.C. § 331 : US Code - Section 331: Mutilation, diminution, and falsification of coins

      Whoever fraudulently alters, defaces, mutilates, impairs,
    diminishes, falsifies, scales, or lightens any of the coins coined
    at the mints of the United States, or any foreign coins which are
    by law made current or are in actual use or circulation as money
    within the United States; or
      Whoever fraudulently possesses, passes, utters, publishes, or
    sells, or attempts to pass, utter, publish, or sell, or brings into
    the United States, any such coin, knowing the same to be altered,
    defaced, mutilated, impaired, diminished, falsified, scaled, or
    lightened - 
      Shall be fined under this title or imprisoned not more than five
    years, or both.