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<p>[QUOTE="physics-fan3.14, post: 626140, member: 19165"]IGWT posted the above on the PCGS thread linked above. I'm not sure if he posts over here or not, but I thought it was worth repeating. I'm not a member ATS (and won't be), so I had to repost it here to reply to it. </p><p><br /></p><p>Dannreuther does seem to be making contradictory statements, but I think his assertion that flat luster comes from worn dies is the incorrect part. My 1950D shown in the original post definitely qualifies as flat luster, but those dies are not LDS. </p><p><br /></p><p>Look at the progress of a die from prooflike, to semi-pl, to regular strike. The prooflike coin is from fresh new dies - any luster present is due solely to the metal moving. Obviously, there isn't much luster. Its the very act of wearing on the die that eliminates the mirror finish and produces lustrous coins. As the die continues to wear, these etched flowlines get stronger, and each strike makes them stronger. Its a reinforcing cycle. Polishing the dies interrupts this process, which is why coins with strong die polish don't appear to have as strong luster. As the die nears the end of its life, the flowlines become very deeply etched (relatively.) These larger flowlines produces very coarse luster towards the end of its life, what I would describe as hard luster. </p><p><br /></p><p>At some point over the life of the dies, there is a balance between great luster and die wear. Depending on what you like, you might call this peak differently than others, but it seems to me this is how the die/luster progresses.[/QUOTE]</p><p><br /></p>
[QUOTE="physics-fan3.14, post: 626140, member: 19165"]IGWT posted the above on the PCGS thread linked above. I'm not sure if he posts over here or not, but I thought it was worth repeating. I'm not a member ATS (and won't be), so I had to repost it here to reply to it. Dannreuther does seem to be making contradictory statements, but I think his assertion that flat luster comes from worn dies is the incorrect part. My 1950D shown in the original post definitely qualifies as flat luster, but those dies are not LDS. Look at the progress of a die from prooflike, to semi-pl, to regular strike. The prooflike coin is from fresh new dies - any luster present is due solely to the metal moving. Obviously, there isn't much luster. Its the very act of wearing on the die that eliminates the mirror finish and produces lustrous coins. As the die continues to wear, these etched flowlines get stronger, and each strike makes them stronger. Its a reinforcing cycle. Polishing the dies interrupts this process, which is why coins with strong die polish don't appear to have as strong luster. As the die nears the end of its life, the flowlines become very deeply etched (relatively.) These larger flowlines produces very coarse luster towards the end of its life, what I would describe as hard luster. At some point over the life of the dies, there is a balance between great luster and die wear. Depending on what you like, you might call this peak differently than others, but it seems to me this is how the die/luster progresses.[/QUOTE]
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