The America the Beautiful Quarters program ran from 2010 to 2021 and showcased national parks from all across the United States. These 4 America the Beautiful Quarters come from the limited San Francisco Mint 50th Anniversary Silver Reverse Proof set which was released in 2018. Each of these coins is struck with a reverse proof finish and is graded in perfect Proof 70 condition. Reverse proof coins  are struck similarly to regular proof coins but the designs are mirrored while the fields are frosted. With each composed of 90% silver, this set includes the 2018-S Reverse Proof silver examples of the Apostle Islands, Cumberland Island, Pictured Rocks, and Voyageurs Quarters. Only 199,177 examples of the San Francisco 50th Set were released, making each of these coins an Absolute Rarity.