2012 American Eagle San Francisco Two-Coin Silver Proof Set EG1.
"The United States Mint has a tradition of offering special limited-edition coin sets to American Eagle Coin collectors. The American Eagle Silver and Gold Programs, launched in 1986, are among the United States Mint’s most popular. The 2012 American Eagle San Francisco Two-Coin Silver Proof Set is an exquisite collection that captures the essence and beauty of these cherished coins. This set -- one American Eagle Silver Proof Coin and one American Eagle Silver Reverse Proof Coin minted at the United States Mint at San Francisco -- is a testament to the fine, exacting craftsmanship that has been a United States Mint hallmark since 1792.
A special feature of this elegant two-coin set is the coin featuring a “reverse proof” finish. Reversing the mirror-like background finish of a traditional proof coin and applying it to the design elements of the coin achieves a magnificent contrast." - Description and image directly from usmint.gov