Are you asking about the filthy particles on the coin or what looks like a moat around the devices? Because I would like to know what causes that.
Often times I have found that light will play some mean tricks. Tilting the coin slowly under the light often solves a lot of mysteries. You should try that and see what happens. But just in case how bout we drop some names and hope they can explain it for us. @V. Kurt Bellman or @paddyman98??
Thanks you sir. But I have experienced that myself so I take several pics to make sure that's not what I'm seeing ! Sure the guys will chime in !