Mirriam's Lincoln design for 1866. This is not believed to be a mint product. A similar design by him was created in 1868 P5105.
This design also exists in the following combinations:
Gold with reeded edge JC1866-1/P5080 with fewer than a half dozen confirmed.
Gold with plain edge JC1866-2/P5085 with only 3 or 4 believed to exist.
Silver with reeded edge JC1866-3/P5090 is possibly unique.
Silver with plain edge JC1866-4/P5095 with only 3 or 4 confirmed.
Copper with plain edge JC1866-5/P5100 with only 3 or 4 confirmed.
Nickel with reeded edge JC1866-6/P5101 with only a single example confirmed. This piece was unknown to Judd & Pollock and was examined by PCGS in May 2014. It is illustrated below courtesy of PCGS.
Incomplete reverse die trials P3302 & P3305 are also known. These are listed by Pollock as splashers for 3 cent pieces.
Photo courtesy of American Numismatic Rarities.