A couple of years ago....I found a Lincoln Cent which is Concave and Convex......A couple of weeks ago I found another (different date.)..... The first coin was found in pocket change......the second one, was found on a flat metal roof (I'm a Roofer). IS IT POSSIBLE....that the heat caused the coin to do this? At first, I thought it (the first one) was an errored coin, a fluke,...until I found the second one. Has anyone else seen other coins like this?
