This experimental piece was supposedly struck in an alloy of 90% silver and 10% nickel but no examples are known. Examples are known as follows: To see images of most of these, click here. Nickel J714/P793 with at least 10 known including examples in the American Numismatic Society, Connecticut State Library, Durham Museum and Princeton University. Earlier editions of Judd listed this as silver-nickel but all examples tested by Dave Cassel were more or less standard coin nickel (75% copper, 25% nickel) with no silver found at all. With the 8th edition, this number is now listed as nickel. Copper J715/P794 with at least 8 known including examples in the Connecticut State Library and Durham Museum. Photo courtesy of PCGS and is the former Simpson coin.