 Class III dollars are identical to the Class II dollar , except lettering similar to that on the Class I dollars was applied to the edge of the coins . Based on the slightly concave appearance of the Class III dollars , it is likely that all were given edge lettering at some point after striking ; as the Castaing machine was meant to be used prior to striking , its improper use resulted in a deformation of the coin surface . Newman and Bressett assert that they were struck at approximately the same time as the Class II dollars , and that the edges were lettered and the coins concealed by Mint employees until 1869 , when one was offered to a coin collector , who rejected it as a restrike . However , numismatist S. Hudson Chapman believed that some Class III dollars were struck as late as 1876 . In 1875 , several were sold by Philadelphia coin dealer John W. Haseltine . Six specimens of the Class III dollar are known today . 
