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robThere are a few generally accepted variations to the t206 set. Most notably are the Shappe, Nodgrass, and M'urray. The specualted reason for the errors are printing plate mishaps that allowed for a group of cards to be printed with minor errors. Mine is the one for sale and is currently on the b/s/t, so I will not comment on price. A M'urray variation went for $7500 in the last REA, it was an SGC 50. I think of the 3, the Shappe is the most "common", however. All of them are quite difficult to find in any condition.