[Abravefan11]

Barry - My guess would be that if Burdick was aware of the T207 Red Cross back, that there wasn't anything about those cards that led him to believe they were a separate issue. Possibly he just saw the Red Cross as one of several brands used in the same issue like many other sets of the time.

With T215-1 and T213-1, as many others have said before me, there were differences that may have led to him classifying them the way he did. With both sets it could have been due to there also being other types. The T213-1's could have been the paper stock and the T215-1's could have been the caption changes. We'll never know for sure what he was thinking.