A few of my one-of-one knowns - assuming Postcards count:
1909 Superior RPPC - Bancroft
1905 RPPC - Cobb
c1943 RPPC - Dandridge
1940s RPPC - Giles
1950 Winston-Salem Team Issue - Weaver
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Working on the following:
HOF "Earliest" Collection (Ideal - Indiv): 250/346 (72.3%)
1914 T330-2 Piedmont Art Stamps......: 116/119 (97.5%)
Completed:
1911 T332 Helmar Stamps (180/180)
1923 V100 Willard's Chocolate (180/180)