I have been watching online for reasonably priced early Jefferson nickel proofs to complete my collection. Many of them exhibit the fine parallel lines shown in this PCGS plate coin. Are those lines evidence of a wipe, some other form of cleaning, or just die polishing lines?
Nickel is a very hard metal, making it much more difficult to strike. What you are seeing are called "roller lines" which are artifacts of the planchet production process. You see this a lot on Canadian steel five cent pieces as well. It is much much more apparent on proof/specimen strikes where the lines stick out against the mirror fields.
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