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Todd (nolemmings)I believe that the blank back Ruths are more likely from m101-5 than m101-4, as far more blank back cards are found in the former than the latter set. In fact, having only recently (about a year ago) started collecting m101-5, I do not recall seeing a single m101-5 with Sporting News back, unless it's one of the shared numbers, in which case it's probably a m101-4. Anyway, the blank backs are more prevalent in the m101-5 set, which presumably was released prior to m101-4, although both began in 1916.