2018 P WW 1 CENTENNIAL PROOF SILVER DOLLAR AND NAVY MEDAL SET WITH OGP+COA. These are original coins and medals honoring the veterans of World War I and the centennial. These were minted at the United States Mint in Philadelphia. There was a maximum mintage of only 350,000 across all options, for worldwide distribution. This beautiful silver proof set comes with all original Government packaging and a certificate of authenticity.