Too large spacing for a reed hit, too small a spacing for being from a memorial reverse hit. just about right for the grooves on a small pair of...
I think the thing that might bother some old timers is that sometimes stackers and CRHers tend to act as if it is something new in coin...
If the surface doesn't matter after sliding down the metallic magnets ( several times), why not just use the jewelers acid test?
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