Would someone help me with this 1964-D Jefferson nickel? How can I tell if it is improper annealing or environmental? I have seen on other forums if high points are showing silver it's environment. Is this every situation with improper annealing or just the black beauty? I have a 1939 as well but there is silver showing
I appreciate the responses, I have researched so many sites on improper annealing and seems to have many different types. Can you tell me how to know if it's environmental so I'm not thinking everything with discoloration is improper annealing?
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