While upside down backs are very cool, in my opinion they are in a different category than brown Old Mill for the simple reason that if somebody is going for a complete T206 back run of 39, they need the brown Old Mill but they do not need the upside down back. There are more back run collectors than error collectors. Just me .02, and not meant to take anything away from the coolness or rarity of upside down backs.
JimB
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