These privately enhanced reverse Proof coins are one of our most popular items. We have taken a gem brilliant uncirculated presidential dollar, layered the coin In pure 24kt gold and then sent it out to a private company who puts the special reverse proof image on the coin. The central image of the president is shown in mirror-like Proof perfection while the background of the coin has a sharp matte contrast. These are privately enhanced coins and are not available from the U.S. Mint.