This is a more finished obverse die trial of Longacre's French head design which was used on J237-J238/P293-P294 among others. It is lacking just the date. Another trial JA1859-2/P3212 also exists which contains just the portrait. To view, click here.
Your editor, Saul Teichman, has always questioned whether this was designed by Longacre or Paquet as the 1859 half dollar patterns used Paquet's punches in the legend "United States of America".
It is believed unique and was part of the materials purchased by the Library Company of Philadelphia from Maxwell Whiteman. It is listed as inventory #19.
Photo courtesy of the Library Company of Philadelphia.