Many types of mint errors are missed by inspectors and are inadvertently released into circulation. Clipped Planchets, Off-Center Strikes, and Wrong Planchets are just a few examples of the many types of error coins that slip out of the mint occasionally. Some errors are fairly common, but many are extremely rare.
Sacagawea Dollar.
Indian Head Cent struck 25% off-center.
Lincoln Memorial Cent.
Struck 5% off-center.
1959-D Jefferson Nickel struck on a cent planchet.
1960-D Jefferson Nickel struck on a cent planchet.
1962-D Jefferson Nickel struck on a cent planchet.
1965 Jefferson Nickel struck on a cent planchet.
1966 Jefferson Nickel struck on a cent planchet.
1970-D Jefferson Nickel struck on a cent planchet.
1974 Jefferson Nickel struck on a cent planchet.
1976-D Jefferson Nickel struck on a cent planchet.
1977 Jefferson Nickel struck on a cent planchet.
1977-D Jefferson Nickel struck on a cent planchet.
1982-P Jefferson Nickel struck on a cent planchet.
1992-P Jefferson Nickel struck on a cent planchet.
1999-D Jefferson Nickel struck on a cent planchet.
2000-P Jefferson Nickel struck on a cent planchet.