I have a 1776-1976 Bicentennial with a possible error. If you look at the front and back of the coin it has a discoloration. On the back where the line of this discoloration there seems to be an indention of some sorts. It is not on any of the other coins I have like this. I am waiting on a magnifying glass to view for more possible errors. Any assistance would be greatly appreciated.
Also, I am new to coins and verbiage so please be patient with me.