I agree that the 1970s seem to be quite stable. My 1970s have been in card savers inside 4 pocket sheets in binders for many years without curling or cracking. I also have an SGC 88 Mays that is doing fine. I even picked up a Richie Allen out of a junk box at the Natty w/o any issues, and it had been floating free w/o a holder for who knows how long. That said, I have seen TPG slabbed cards with cracks and high grades, so they can crack after being encapsulated. I've put some mildly curved cards into card savers/sheets w/o trouble. I try not to purchase cards with significant curvature in the first place, as I am concerned with cracking, and there are enough examples out there to avoid the ones that have rolled up.
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