@buck, first welcome to CCF. Second, thx for following up your first thread with this one containing pics. To help others respond to your specific questions, I've copied your text from this earlier thread here:
Quote:I'm a small collector of
US coins most for novelty purposes. But I came across a 3.1g us penny with
no mint mark condition is pretty dam good but I'm no grader but the details of both side are chips clean a very clear. So one noticeable error that I rarely seen was
no mint mark and then I noticed the date at first glance I thought it was 1931 penny as I picked up up to use my magnifying glass I saw that the thrird digit in the date would change to an 8 then a E the a S. So I looked closer and yes even under a magnifying glass up close it was definitely changing characters. Slo I flipped it over to see the memorial side and right off the top on the right side last 2 steps the LETTERS EG are noticeable so any help will do I have a unique error coin or is it post mint