i found this link to be a fascinating (and long) read on M101-4/5 backs and their "relative" scarcity to each other, distribution, etc
https://www.oldcardboard.com/m/m101-...scarcity4b.pdf
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Collection is Varied and Ever Changing, T207, T206 oddbacks, and vintage (1957-66) buybacks are current priorities
Successful transaction(s) with npa589, Andrew T206, Chesbro41, premiercardcollectors, dougscats, kzoo, Smyers16
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