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Fred BIt is generally accepted that the Clemente nodder, Groat Hartland, and Greenberg HoF bust are the rarest in their respective sets. I have been watching various auctions, and sales over the past couple of years and I have concluded the following: The Groat can be had, 3 sold on ebay in the last 6 weeks. The Clemente is tough but the big auction houses often times include one in their catalog. The Greenberg, on the other hand, is just not offered. It is, I believe, the most difficult to acquire. Your thoughts.