I only think its on the planchet, ( copper 1863 312a )
Here's a new image after its been in a hard arcic case for 10 years or so ....
I've own this coin for years and I found it roll searching quarters . I just weight it and it weights 5.7 grams . It should weight 6.22 grams,...
They look like die groves to me Or the " Die Grooves " that he took images of ...
Could be " Markers " ...
I understand that, but thoses could be " Markers " ....
Separate names with a comma.