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Art M.The T206 Old Mill brown back cards are quite rare. Unfortunately it seems every time one appears on Ebay it turns out to be the "faded black" variation.
The Old Mill with brown backs are the same color as Broad Leaf backs. When you see one in person there is no mistake on the brown vs. black difference.
All of the genuine Old Mill brown backs I have seen appear hand cut or smaller than standard sized T206 cards.
Here is a scan of mine from several years ago:
