Mantle
Bob--beyond the current supply versus demand for the card you mentioned, I do not know what else would be causing the increases you noted. I am not a Yankees fan ( a Cardinals guy) but I have 2 of them, a function of my compulsion to include all recognized variations with all my Topps sets.
There have been several recent thread in here with folks stating their intention to pursue this card. If you are a post war collector in general this seems to be the most "got to have it" card, and there seem to be a lot of 52 set collectors as well
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