"Tough" backs
Here's another noob question for everyone lol:
In the T206 set I often see common backs labeled by collectors as a "tough back" for certain players. Is there a resource that can help collectors find out the scarcity of backs for individual cards? If I'm paying a premium for a Piedmont 350/25 or a Sweet Caporal 350/30 I just to make sure I'm not over paying. Thanks!!
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