The famous 1884 trade dollar struck in copper. As with most die trials made from the 1860s onward, these were deliberately struck. The two known examples were presented to A.M. Smith who wrote several visitor guide books for the Mint. The first was sold as lot 245 in Bolender's 10/35 sale and the other was sold as lot 25 in Bolender's 2/36 sale as part of a partial 1884 copper proof set from the quarter to the double eagle that was offered individually. Both known examples have since been silver-plated with the following later pedigrees: 1) Anderson-Dupont-Stacks 11/54, Emmons-Stacks 9/69, Delp-Stacks 11/72 and was presented to the Smithsonian in 1979. Click on the thumbnail image to enlarge. Image courtesy of the National Numismatic Collection of the Smithsonian Institution. 2) Numismatic Gallery 8/49 ANA?, Kreisberg 9/61, Kreisberg 6/65, Kreisberg 11/65, Superior 75 ANA, Hughes 7/80, Dr. Linkner, ANR 1/04, Heritage 4/17, Wyoming collection - PCGS60. Photo courtesy of American Numismatic Rarities.