I can assure you the guy who buys is it will say it adds to the known master set of T206 backs.
I'm curious whether this was a deliberate attempt to use different color ink, say a test run using blue, or merely a chemical reaction over time causing the black to turn blue. Now I don't know if that is even possible, but I am by nature skeptical so when a new T206 color variation shows up for this first time at this late date, I have to wonder.
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