[tbob]

Andrew- yes, Factory No. 3 is correct.
Patrick- I would beg to differ with you on the Cycles not being tough. I think you have to factor in that all non-Recruit back cards are tough in general and then examine which of the Broadleaf/Anonymous/Cycle backs are tougher for each card. I partly agree with you that Cycles are not the toughest of the 3 (I think Anonymous backs are the toughest) but after I completed my set I began to go after a subset of all red Cycle backs for the tough cards and believe me there are several which just don't seem to appear ever with the Cycle backs. I don't know if this is because collectors prefer that bright red Cycle back and hold on to them for their collections as opposed to the drab Anonymous backs or "in-the-middle" Broadleafs...
Chris- yes, there are non-completed sheets of T206s besides advertsing sheets.

And of course the almost impossible Red Cross backed T207s meet all qualifications of being "rare."