Since 1992, the U.S. Mint has issued special silver proof sets in addition to regular base-metal proof sets. These sets revived the tradition of 90% silver dimes, quarters and half dollars.
1999 Silver Proof Set. The 1999 silver proof set contains the coveted first five State quarter proofs (Delaware, Pennsylvania, New Jersey, Georgia and Connecticut) as well as the silver dime and half dollar and the cent, and nickel. Its 804,565 mintage was well below the first 1992 silver proof set's output of 1,009,586.
2000 Silver Proof Set. Over 3 million of the year's clad proof sets were produced, but only 965,421 silver sets were output. Features silver State quarters honoring Massachusetts, Maryland, South Carolina, New Hampshire and Virginia.
2001 Silver Proof Set. In 2001, only 889,697 were produced in this premium form, compared to 2,294,909 clad proof sets. Features silver State quarters honoring New York, North Carolina, Rhode Island, Vermont and Kentucky. Deep-struck frosted engravings contrast with mirror backgrounds.