Just pulled this out of 1964 Proof mint set. At approximately 11:00 on the rim between I and B of LIBERTY is what appears to be a Cud. And remarkable toning! Is this worthy of sending to Cuds on Coins?
Thanks for the responses everyone. Certainly the toning on the field around what looks like a Cud is likely the result of a hole in the cellophane. But, the semoi-circle area at issue on the rim is raised. So, if not a Cud could this be a small area of sunken die?
Update---You CC foks who responded were right. I used MS70 to remove the unwanted toning on the coin, and surprise---the semi-circle "toning spot" or "carbon spot" (whatever it may be technically) partially disappeared. So, you were all correct in your assessment that it was not a Cud. The coin looks much improved with the dark toning and the less noticeable "spot." Again, thanks to all who weighed in correctly with the helpful responses.
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