I'm just glad I didn't have to immediately follow Matty!!
Here's my 6 (since the OP even broke his own rules):
1909 Bancroft & 1905 Cobb:
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c1943 Dandridge and c1943 Campanella:
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1937 Williams and 1892 McGinnity:
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http://imageevent.com/derekgranger
HOF "Earliest" Collection (Ideal - Indiv): 244/342 (71.4%)
1914 T330-2 Piedmont Art Stamps......: 114/119 (95.8%)
1923 V100 Willard's Chocolate............: 177/180 (98.3%)