Plastic pages were prevalent at shows by 1975, to judge by the pictures in SCD and the ads for the pages that were all over SCD then. Not sure when they were introduced specifically for baseball cards, but my guess is the early 70s. I'm sure i could pinpoint it more exactly if i triied. I remember around 1980 there was a big to-do in the hobby about how the PVC used in plastic pages up to that time could damage cards long term, and the shift to non-PVC pages (which have been standard since then.
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