1999-2009 US Mint SILVER Proof Sets 127 Coins, 11 Complete Sets Over 14.5oz Of Silver Full State 25c Set. 1999-2009 Red Box US Mint Silver Proof Sets - 127 Coins Total, 11 Complete Sets. This set encompasses the entire 50 State Quarters run, as well as the 6 US Territories quarters and four 2009 Lincoln cent varieties. The Silver Proof set became a standard product of the United States Mint in 1992, containing a dime, quarter, and half dollar composed of 90% silver. The compositions for the penny, nickel, and dollar (introduced to the set in 2000) remained the same as in the standard proof sets.