very nice Dreyfuss, Chris!  
Mine would 
definitely be this postcard from HOF umpire Bill McGowan to his girlfriend, postmarked in 1915:
 
		
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http://imageevent.com/derekgranger
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)