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JayLet me shed a little light on the cardboard stock issue. For 1948 Leaf football cards the cream colored cardboard came before the gray stock. This can be seen by the fact that the low numbers all have cream colored backs while the high numbers all come with both cream colored and gray stock. Once we got to the 1949 Leaf football set the only option was gray stock. Now I don't know when in 1948 the boxing set was issued. However, from the way the football set was produced it would not be hard for me to believe that the cream colored boxing backs came before the gray backs.