Here's a few I haven't seen yet. The 1921 Herpolsheimer's are all 1 of 1's, so this McGraw is it. The Number 7 Cigar card of Clarkson only shows two total graded by SGC, with a single graded example of a related issue, Diamond S Cigars graded by PSA, so maybe three graded in total. And the Helmar backed Cobb is one of only two, maybe three, known to even exist.
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