1931 W502 vs 1931 W-UNC
Any difference between these two sets -- 1931 W502 vs. 1931 W-UNC? I believe the W-UNC are blank backed and the W502s have writing on back (at least according to Brad's Lefty Grove website). Any other differences like numbering or card stock?
I see both listed in the SGC population reports.
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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%)
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