Hello and thany you for checking out my first post. I'm new to the coin hunting hobby and have discovered this Nickle and do not know what or how to label this strange error. In the forehead area of Jefferson, we can see a D mint mark, and above that, the faint outline of a year. I can not find any other examples online to learn what I have found. The rest of the coin does not appear to have any other errors that I can tell. I would really appreciate the advice, help, and identification, and guesstimate on value/worth submitting to grading from more experienced collectors.

