In 1999, the U.S. Mint introduced the far-ranging Statehood quarter series, which concluded in 2008. The series honored all 50 states in the order in which they entered the U.S.A. Comprising 18 distinct coins, the 1999 U.S. mint set surpassed any previous issue in size. Included were both Philadelphia (P mintmark) and Denver (D) issues of the cent, nickel, dime and half dollar, plus the five unique one-year P & D quarters honoring the first states to enter the Union (Delaware, Pennsylvania, New Jersey, Georgia and Connecticut). Like all U.S. mint sets, the 1999 issue was struck in Brilliant Uncirculated quality. Its mintage was just 1,243,867, about half that of the much smaller 1999 U.S. proof set. Because of the break-through importance of the 1999 mint set, it's very sought-after today.