Possible 2005 Proof Lincoln Cent With No Frosting Or Mintmark?

Sometimes an answer to one coin, will actually answer several of the issues you see on your other coins. My purpose in posting is to help train the new collector on what to look with the approach of telling what I see. That way that information can be remembered and used on further searching you do. So I seldom give yes or not answers, but tell what I'm seeing to help others to learn. If is just not you that benefits, hundreds of others look, read and learn as well. It is an interchange of information.