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