1942/1 Die Error Mercury Dimes It is an example of a die error coin. In this coin, two different dates got overlapped due to an error in the die preparation process.
When changing the obverse die for this coin, the last digit of the previous year’s date was not fully removed.
1922 No D Lincoln Cents No 1922 Lincoln pennies were minted in the Philadelphia mint (where the coins would not receive a mintmark).
All of them were minted in Denver mint and should have a D mintmark on the obverse side. However, due to the use of a heavily worn die, the D mint mark was weak in some coins.
1969-S Lincoln Cent- Doubled Die Obverse It is estimated that there are only about 40 to 50 specimens of 1969-S Lincoln penny-doubled die coins that survive today.
Experts at the Professional Coin Grading Service (PCGS) stated they could track only about 30 known examples of this rare coin.
1974-D Aluminum Lincoln Cent During the second half of the 20th century, the US Mint experimented with many metals to bring down the cost of coin production.