Two obverse dies are known but it is unclear if they were used on this pattern.
Examples are known as follows:
Nickel J461/P535 which is relatively common with possibly 2 or 3 dozen known.
Copper J462/P536 with less than a dozen known.
Copper-nickel (88-12 or 90-10 copper to nickel? J463/P537 with only 2 or 3 known. The only recent listings are Merkin 9/68 lots 424 & 425. That sale mentions Cogan's 4/1877 A.S. Jenks and Morgenthau's 11/36 sale for other listings. These have not been tested to determine their actual composition.