2020 Silver Medal Mayflower 400 Anniversary PCGS PR70 Reverse Proof Box CoA PCS. This is a Nice Set for the 2020 Reverse Proof Mayflower Medal. The Set Was Originally Made by PCS Coins & Stamps and Includes. PCGS Graded PR70 2020 400th Anniversary Mayflower Silver Medal. Certificate of Authenticity From the US Mint. Locking, Felt-Lined, Wooden PCS Display Box with Key. PCS Certificate of Authenticity. There Were Only 425 Sets Like This Made by PCS. Please See Pictures For Everything You Will Receive.