The 1999 proof set includes the cent through half dollar and all five proof condition statehood quarters: Delaware, Pennsylvania, New Jersey, Georgia, and Connecticut.
We are approaching the 100th anniversary of the Lincoln cent which started in 1909 with Lincoln as the first person with his image minted on U. S. coins.
1999 was 1st year - of US State Hood quarters and the silver proof set, the most expensive proof set in history! The mint was trying to revive interest in
coin collecting with the state quarter program.
1999 was last year - of the Susan B. Anthony dollar which was rejected by the public because it looked so much like a quarter.
All were made at the United States government San Francisco "S" Mint.