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Brian HThe toughest t205 is easily the no stats variation of Hoblitzell. The other cards that are very difficult include the aforementioned Joss, the hatless variations of Wallace, Moran (the variation with a stray line), Graham & Shean (the versions with the Cubs), Collins and Bresnahan (mouth open variations), Kirby White, George Suggs, Bill Dahlen and "Bugs" Raymond.
Don't know the T207s as well but I would think the more difficult ones include "Smokey" Joe Wood and George (Buck) Weaver. These two also have greater demand because of the subjects not just the scarcity for the set collectors.