1990 S Proof Set 10 Pack Nice Original Boxes & COAs US Mint 50 Coin Lot. 1990 S US Mint Proof Sets. Original Boxes in Nice Shape. Similar to Sets Shown. Up to 10% off BIN Price. Less than that will be auto declined. To combine more items you can take up to 7 days to pay. Please Allow up to 30 Days for Late Packages. 30 Day Return Privilege.