David Akers (1975/88)
This is the first date of which proofs were definitely made for collectors. Three proofs exist, two of which are impounded in the Smithsonian and ANS collections respectively. The third is the Memorable - World's Greatest Collection specimen from the 1946 auction sale. It earlier appeared in the famous Parmelee sale of 1890.
There are three known 1858 proof double eagles. There are two coins in the Smithsonian Institution, one from the original Mint collection, and one from the Lilly collection. The other example is in the American Numismatic Society collection, donated a century ago by financier JP Morgan, an avid numismatist. There is a fourth specimen that has been called proof, but experts now dispute its proof status. It last appeared in auction in the 1946 "Memorable" sale, and its pedigree is back to the famous 1890 Parmelee sale. Collector extraordinaire John Pittman said that he didn't think the coin was a proof and he stated that if he had thought it was a proof he would have bought it at the Memorable sale.