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Message:: [QUOTE="physics-fan3.14, post: 3204002, member: 19165"]Die state isn't really relevant to the PL designation. More important is how recent was the polish. I have some PLs that are clearly from brand spanking new dies - they were the first couple dozen strikes from a brand new die that was polished before putting into service. But I also have PLs that are clearly from later die states, exhibiting die cracks and the stresses of life. I suspect that these had clashed at some point, were taken out and polished to remove the clash, and then returned to service. For example, I suspect this is exactly what happened with the reverse of the 55S. If you look very closely, there are die cracks in both wheat ears, and small die breaks as well. It is hard to see in this photograph, but there is evidence of a die clash on the reverse between the O and C. The only thing that really matters for PL is the depth of the mirrors. Sometimes the polish brought out mirrors, and sometimes it just left die polish lines. On this coin, especially the reverse, the mirrors just aren't as strong as they need to be for the PL designation.[/QUOTE]