I used the pages my mom had for photos around 1979-80. She'd buy me 9 pocket pages when she ordered the various sizes she needed for her albums. I still have a good number of non-prime cards in pages from those days and the cards are well preserved. I'm pretty sure the pages were non-acidic, etc and maintain the cards nicely. The occasional sheet has puckered a bit, but most are fine.
The other protection devices from that time that I remember are screw downs and a version of a snap case. Both of those were worse for the cards than sheets, but dealers would often use them to highlight some of their more expensive cards.
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