This is an extremely rare pattern which is also double struck. There are only two certified including this piece. It is a die trial of the regular design for the 1873 Closed 3 $20 gold piece that was struck in copper. It was double struck in the collar with rotation between the two strikes. Considerable detail from the original strike is visible on the obverse, on the stars, date and portrait. The reverse also shows considerable detail remaining from the first strike as well on UNITED STATES OF AMERICA, TWENTY D. and the eagle. The close-up photos below show the rotation on this double struck $20 pattern.