Are you sure it is a strikethrough, and not just a fiber inside the case? It doesn't look like a strikethrough to me. Chris
I'm not convinced, at least not from that photo. Perhaps the OP can back off a little to show us a little more of the coin. Chris
If the coin is in a plastic case, another possibility would be to tap the side of the case against the table to see if the thing moves. Chris
Many sources for this, uniform, gloves, hair net, etc. Always a possibility. I found one last year and picked up $10.00 for it on ebay. (2009P FY cent)