1999 thru 2003 S Proof Silver Quarters 25 Coins 5 Sets No Box. Here we offer five silver proof quarter sets without box or COAs. The United States Mint did not offer these sets on their own with box and COA. Your only way to obtain them for these years was in an annual US Mint Proof set with other coins. The 1999 coins are key date for the series. The coins offered here are beautiful gem cameo coins you will be pleased to have in your collection. Obverse Designer: John Flanagan and William Cousins. Reverse Designer: William Cousins.