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<p>[QUOTE="physics-fan3.14, post: 623972, member: 19165"]Just wanted to add and elaborate that Bad Thad is correct about proofs having flowlines. They are just much harder to see, and usually are only evident on lower quality proofs or later die states. Because for much of numismatic history proof dies were only used for a few hundred or maybe thousand coins, they rarely ever got to this state. As the mirror finish of the die begins to wear away through repeated striking, the flow lines which produce luster will begin to appear. You will notice on these that the mirrors appear more shallow. This is the same process that turns a DMPL into a PL, and then finally into a normal coin - eventually the mirrors become less deep.[/QUOTE]</p><p><br /></p>
[QUOTE="physics-fan3.14, post: 623972, member: 19165"]Just wanted to add and elaborate that Bad Thad is correct about proofs having flowlines. They are just much harder to see, and usually are only evident on lower quality proofs or later die states. Because for much of numismatic history proof dies were only used for a few hundred or maybe thousand coins, they rarely ever got to this state. As the mirror finish of the die begins to wear away through repeated striking, the flow lines which produce luster will begin to appear. You will notice on these that the mirrors appear more shallow. This is the same process that turns a DMPL into a PL, and then finally into a normal coin - eventually the mirrors become less deep.[/QUOTE]
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