1979 D & 1999 Lincoln Cent

Thanks for your definition. Most of the time they ask: "What is this?" and you have to try to find what they are looking at.

These are both the same type of problem. The post on the die that forms the inside device has broken off the die. The coins struck with this die will continue to show this area for the rest of it's life. No extra premium for this as it is common. But on some Varieties it can be used as a marker for that die that the variety is on. Just because a coin has that marker though doesn't guarantee that it is that variety. Or just because you have that variety and the missing post if there doesn't make that not that variety. (You coin may have been created before that event of the post broke off. So it is just a normal event for a die. No premium. Sorry. Hope this helps?

Thank you both for your responses! Help's out greatly.