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T206Collector...covered by SGC's guarantee, Wes. Just send them an e-mail and ask for yourself.
Andrew's experience above is consistent with every story I have ever heard from SGC and others. I have never heard of a 3d-party purchaser being shut out of an SGC buyback.
Edited to add that my personal communications with SGC consist of sit downs with their representatives at card shows and the occasional e-mail about a grading issue.