1999-S 50 STATE QUARTERS PROOF SET - 5 COINS 1999 QUARTER PROOF SET IS THE "FIRST" of the 50 STATE QUARTERS PROOF SERIES. Included are DELAWARE, PENNSYLVANIA, NEW JERSEY, GEORGIA, and CONNECTICUT state quarters. Each set is housed in its original government holder and box with the certificate of authenticity. The coins were struck at the San Francisco Mint in a copper-nickel clad composition. The 1999 United States Mint "50 State Quarters" Proof Set contains 5 coins. These frosted United States Mint proof coins are extraordinarily brilliant, with sharp relief and a mirror-like background. Sculpted foregrounds give them a special cameo effect. Proof blanks are specially treated, polished and cleaned to ensure high quality strikes. The blanks are then fed into presses fitted with specially polished dies and struck at least twice to ensure sharp relief. The coins are then packaged in a protective lens to showcase and maintain their exceptional finish. This genuine United States Mint proof set is not only a RARE & HISTORIC collectible, it also makes an impressive gift for friends and family.