I'm not sure about this coin, but I might be able to help with the discovery. I have found that by creatively lighting the coins, I can get much better photographs, and by viewing the much enlarged coin,
by virtue of the photo itself, I can see details clearer than I can see in any other way, much better than direct observation. (need a camera that takes great close-ups)
Double sided lighting works very well. strong direct overhead does for certain conditions. Single side lighting is my standard. So, I start with that and slowly rotate the light 360 degrees around the sides of the coin.
Double sided is where you place one light source from one side, esp. perpendicular to the sides of each letter or number. Then the second light source is moved using direct side lighting or raising it up a little
and continually moving it until you can maximize the details. You can also add more lights, but usually need no more than 2.
Getting rubbings can be helpful as well.
If you already know all this, sorry..