"When I was a kid I didn't even realize what a "series" was. I just bought whatever cards were in front of me...."
Even more so in the 1950's: the only clue we had back then was the card number, which indicated how many cards were issued up to that point, but not beyond, absent a checklist. But, when did the notion of "series" enter the collecting consciousness - at least for kids? Maybe not until there was some available data on printing processes - the mid '60's?
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