Yup, gotta see it. If I had to guess without seeing it, it probably had a cent pressed into it or into a foreign substance on the coin like glue. In these cases it would be worth twenty five cents.
If the impression from the Lincoln cent shows the devices, lettering, etc. backwards, then it is PMD. Chris
Exactly, if everything is backwards it means the coins were placed in a vice and smashed together. This is pretty common to see and it is considered damage to a coin. If youpost a photo we can verify it.
