Posted By:
JimBI would say that the Wagner card comes up about once a year. The Plank comes up about the same and the Magie error a bit more frequently. The Ty Cobb/Cobb back seems to be offered every two or three years which make sense since there are only 12 or 13 of them and about 50-60 Wagners and Planks. The toughest card is the Doyle N.Y. Natl'. I suppose it is considered a verified card now. It has been offered publically for auction twice in the last six years or so, but I don't think it was publically offered before those two. Maybe somebody can correct me on this. There are only 5 or 6 known examples of this. Supposedly two reside in the personal collection of (I am forgetting his name) in Wisconsin, but I don't know if anybody has verified those.
JimB