Dates used on these pieces were often evasive, and are as follows: 1771, 1772, and 1774 through 1776 for the first group; 1747 and 1787 for the second group; and 1776, 1778, 1787, and 1788 for the third group. Pieces generally attributed to Atlee can be identified by a single outline in the crosses (British Union) of Britannia’s shield and large triangular dentils along the coin circumference. The more-valuable American-made pieces are not to be confused with the similar English-made George III counterfeits (some of which have identical dates), or with genuine British halfpence dated 1770 to 1775.
The muled coins of Group IV are listed separately with the Immune Columbia pieces and with the state coins of Connecticut, Vermont, and New York. Other imitation coppers made by unidentified American makers are generally very crude and excessively rare. Cast copies of British coins probably circulated along with the imitations without being questioned. Counterfeit copies of silver Spanish-American coins and Massachusetts tree coins may have also been coined by American minters.