1984 - no mint mark. Check for a double-ear! A double-die most noticeable on Lincoln's ear - it looks like he has two ears mixed together on the side of his head! Very famous. Considerably valuable, depending on how much the flaw stands out.
It would be correctly called a doubled die or a DDO for short. If the doubling was on the reverse, it could be called a DDR. Chris
You will need a scope with a better picture for any of us to give you a better idea of what you see. See photo attached.
Guys, you can either be helpful or just not post, there is no reason to be snarky. Use the ignore feature if needed, but stop the attempts at humor, it sets you up for undesired events. Burt, if you look at tommy's post, you can see yours are not the 1984 DDO. You might check out Coppercoins.com that has the large search engine for Lincoln varieties. Jim
Snarky sarcasm is a great teaching tool, unless your student is a dog. They don't have the sarcasm gene - just a confused head tilt.