Your pics are a little too out of focus for me to work with in the photo editor.
An exact measurement might be helpful.
Also, knowing the general location of the find can influence the research possibilities. If it's California vs. Connecticut, the research can go in a different direction.
Try using a medium dark, solid color, non-reflective background and back off just a little. Your resolution is high so we can zoom in digitally on the (hopefully) in-focus details of the coin.