This has been mentioned before, but some non-sport Old Mill cards have blue ink like the kind this T206 has. Take a look at the border around Walsh's portrait. That ink is also blue (not black), i.e., it's not just the back that's different.
If a typical hobby pattern holds, another one of these may appear. Many 'one-of-a-kind' items turn out not to be unique. We've seen this many times before. I'd be just as skeptical as some of the posters here if I hadn't held the card in my hand. But, I did, and I'm confident it's legitimate.
Bill
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