This is not a mint error per-se but rather a very common type of Mechanical Doubling which does not add any additional value to a coin.
Collecting since 1972. Learning from then on
"Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin
7070 type set coin count: 51/76
Uncirculated American Silver Eagles
My American Silver Eagle Proof Collection
Sacagawea Dollars
Innovation Dollars
Eisenhower-Dollars
Kennedy-Half Dollars
Washington-Quarters
Roosevelt-Dimes
Buffalo-Nickels
1938-2005 Jefferson-Nickels
Lincoln-Cents
"Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin
7070 type set coin count: 51/76
Eisenhower-Dollars

























