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Doug AllenThe white cap is rarer. It was also earlier as it was first issued in the 150 series whereas the dark cap was first issued in the 350 series. All cards first issued in the 350 series are the most plentiful. I guess one could surmise that the initial issue (150) was so popular they produced the 350 in much more significant quantity especially the new players, poses introduced.
I don't see the dark cap as a replacement, many of the series overlaped.