Posted By:
WesleyWith twelve or thirteen known Cobb w/ Cobb backs out there, it is safe to say there are fewer examples of each and every one of the T206 Cobbs with the rare backs that you have listed above than the "rare" Cobb w/ Cobb back.
Of course, it is impossible to know how many of each of these exist, since many collectors are so private about the contents of their collections. Also, since many collectors do not believe in grading, the graded population reports may not be an accurate reflection of the scarcity of these cards.
According to the thread about the recent brown Lenox discovery, there are only two brown Lenox backs known. I have heard of only two Broadleaf 460s. My guess is one of these two backs are the hardest ones to find.
I would be very interested to hear the thoughts of other Ty Cobb or T206 or rare back collectors.