Shine a light at it on an angle. That has helped me to figure out the date on a few of my worn silver coins.
+1 good idea !
Like sandgroper said, try shining light on it at an angle, I tried to use software to enhance the details but it didn't seem to help much.
View attachment 415422
Here you go... https://youtu.be/oT8XBoCI64k
How can you tell it's a dime? LOL
It looks like it may be beyond help
I can picture the arm if I use my imagination but it could also be incidental markings. There’s NO other detail anywhere? What does it airtest as?