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<p>[QUOTE=&quot;YNcoinpro_U.S., post: 131990, member: 3225&quot;]I have acquired many U.S. proof sets (I wont give the actual amount, but its a lot) from my grandpa from 1955-1964, some being opened, but most are still sealed since the day they left the mint.&nbsp; I was wondering if I should open a few (I know that this substancially lowers their value) and see what the conditions are or should I just let them sit unopened and relatively unappreciated.</p><p>I would like as much advice as possible</p><p>Thanks[/QUOTE]</p><p><br /></p>

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