Two obverse dies are known but it is unclear if they were used on this pattern. In nickel, these are relatively common with possibly 3 dozen or so known. Examples are also known in copper J462/P536 with less than a dozen known and also copper-nickel (88-12 or 90-10 copper to nickel?) J463/P537 with only 2 or 3 known. These have not been tested to determine their actual composition.