What are the rarest backs (not just T206 or T Cards)
I just picked up a T215 Pirate back, which goes well with my T206 Brown Old Mill and Brown Lenox. I am very well versed in T206 and the scarcity of T206 backs, but less familiar with other T and E card backs. Wanted to get your take on what are say the 5-10 rarest backs of pre-war cards? To clarify, I am not interested in the front/back combo, and I am talking straight up baseball card back/advertisements(not post cards, cabinets, etc.)? And of course, links to previous threads are helpful and expected (I doubt this is a novel question). Thanks
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