My experience as a kid was about 3 weeks earlier than you have shown for each series. In 70, 71, 72 I clearly recall having cards by the first week of March, just after Spring Training opened but I suspect the further West you were, the later they came out. I also remember having 1970 high numbers before the playoffs started that year and in 71 I had high's before school started (i.e. around labor day).
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