Well, since the sets are boxed and known it is clear that any card not in the boxed set isn't an MB card, but Topps definitely used the MB-type card stock for some regular cards. I have a 1968 White Sox team card that is the same stock as an MB card I have. When the two are placed side by side with other 1968s they stick out. Perhaps there should be a premium or other differentiation as to these MB stock cards, like the 1954 or 1956 stock variations?
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