Judd 407 is an unusual pattern in that the metal used to strike the coin was an unrefined combination of copper and silver. Supposedly, this ore mixture was from Michigan, and the employees at the Mint simply rolled it out "as is" for use as planchets. As a result, the know examples have fissures, laminations, and missing metal that are simultaneously off-putting and charming. Most of the examples we've seen have a silver side opposite a copper side, though there may be combinations of each. These were struck from the normal dies of 1865; their purpose is unclear, as the resulting coins would never have been acceptable for circulation, nor would the Mint have mixed silver into the normal bronze alloy for a Two-Cent piece.
Less than a dozen examples are known, all in MS63 or lower condition.