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JimBThere were six known Ty Cobb backs when Rob Lifson made his famous find of five more in 1997. One additional copy was found a few years later (I believe in Kentucky, but could be wrong in my memory of the location), bringing the total to 12. When Nagy's example came to market, some people started counting it as the 13th, but I can't imagine it was not counted by Rob among the six known back in 1997. Obviously Nagy and his collection would have been well-known in the hobby. So if the Russell copy was also not one of the pre-1997 six known, then the total would be 13.
JimB