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How do uncirculated coin sets have damage?
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<p>[QUOTE="tommyc03, post: 3658557, member: 17665"]Even if these sets were never opened there is never a 100% guarantee that some coins could not have been mishandled when they were assembled at the Mint. The Jefferson nickels almost always had imperfections on the reverse. Philly quality control has always been a subject of consternation. They really do not have the same quality control in place as Denver or San Fran. In addition, it is always also possible to see spots form eventually as all plastic is permeable and therefore subject to the coins environment. Maybe stored in an attic, a cellar or even a closet without the right humidity and temperature. I have often found fibers inside both Mint & Proof sets, likely from the handlers gloves. A dusty environment at the Mint could also allow fibers and dust into the cases before they are sealed. The coin most likely to suffer is the cent post 1982 as they have a tendency to spot from the poor make up of zinc with the copper plating.[/QUOTE]</p><p><br /></p>
[QUOTE="tommyc03, post: 3658557, member: 17665"]Even if these sets were never opened there is never a 100% guarantee that some coins could not have been mishandled when they were assembled at the Mint. The Jefferson nickels almost always had imperfections on the reverse. Philly quality control has always been a subject of consternation. They really do not have the same quality control in place as Denver or San Fran. In addition, it is always also possible to see spots form eventually as all plastic is permeable and therefore subject to the coins environment. Maybe stored in an attic, a cellar or even a closet without the right humidity and temperature. I have often found fibers inside both Mint & Proof sets, likely from the handlers gloves. A dusty environment at the Mint could also allow fibers and dust into the cases before they are sealed. The coin most likely to suffer is the cent post 1982 as they have a tendency to spot from the poor make up of zinc with the copper plating.[/QUOTE]
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How do uncirculated coin sets have damage?
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