Ted,
Those are the six backs that Cobb comes with and have been confirmed by my research (meaning, I own one, held one or have seen very clear scans of one).
I will tell you that a T205 Cobb will most likely never occur with a Hassan 649 back. It is in a grouping of cards that is not found with that particular back. Hassan 649 backs are also common, not like a Hindu or Broadleaf card from either T206 or T205. One certainly would have been seen by now. Is it impossible...not at all since new finds are popping up all the time but I stand by my theory and research.
Incidentally...the cards that fall into Cobb's grouping tend to be several of the cards that were replaced or switched in later print runs. T205 print runs are far more complicated than T206 print runs with certain cards being switched out, fixed, eliminated and added.
Joshua
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