The emery disc overlapped one side of a silver eagle planchet before the strike, and the two were fed together for the strike. The emery disc separated from the coin after the strike. The obverse shows the dark gray/blue color and granular texture of the emery disc, but all major design details are perfectly evident, including the date. The finely-grained tan-brown reverse shows only a faint incused and reversed impression of the obverse, as struck through the disc, along with a couple of letters and numbers as printed on the emery disc prior to the strike. Very High Grade, SUPER RARE ERROR!