The Innovation Dollar Proof Set 2020 4 Coins Uncirculated OGP includes a set of four uncirculated $1 copper coins struck with a proof finish in San Francisco. These coins are officially graded by the U.S. Mint and are part of the United States currency. Each coin has a fineness of 0.75 and is certified with a KM Number of 101. As a collector's item, this set showcases the beauty and craftsmanship of U.S. coins in pristine condition.