2019-S Enhanced Reverse Proof Silver Eagle PCGS PF70 with COA. No. 26289. No returns. Shipped with USPS First Class. The lowest mintages ever of Silver Eagles ever made is this coin. Only 29,707 of the 2019 S Enhanced Reverse Proof exist and far less of them exist in perfect 70 grades. This is arguably the most beautiful silver Eagle ever minted and certainly the rarest of the Silver Eagles.