These coins are struck using the same process as circulating coins, but with special quality enhancements such as slightly higher coining force, early strikes from dies, special cleaning after stamping, and packaging Mylar. In addition, these coins are accompanied by a "mint mark token" to show the Mint of manufacture.
This token is struck on a cent planchet. Each 18-coin Uncirculated Set contains two envelopes, one holding coins from the Denver Mint and the second containing coins from the Philadelphia Mint.
Each envelope contains two Mylar packages, the first containing the cent, nickel, dime, half-dollar, and mint mark piece. The second will contain the five state quarters issued in 1999::
- Delaware
- Pennsylvania
- Georgia
- New Jersey
- Connecticut