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Chris CountsI don't know the answer, but I'm curious as well. I'm guessing the first set in 1921 is the most common. I see by far more of them than any other exhibit set. The PCL exhibits are clearly very scarce, perhaps the scarcest of all. Another card I'm curious about is the Gehrig that is listed on the "1939-1946" exhibit checklists. After over three decades of collecting, I've never actually seen one. If someone has one, could you post an image of it?