Thanks everyone for the advice, I ended up ordering some gaylord archival mylar sleeves along with some acid free negative backing that I'll cut down to binder size, I'm hopeful the combo will provide some stability.
The cards still in their cellophane are going to get wrapped between acid free backingboards and a mylar sleevearound the group, and then the outer boards will be stabilized with some painters tape to make a pressed bundle. I'm hopeful that will give the cellophaned cards some stability before they get put back into longer storage. I don't know if the cellphane is a good or bad idea, but it seems novel at least, and that's how they've been for the last 110 so whatever. If anyone has an opinion on that, feel free to chime in.
I appreciate all the kind comments, this collection hasn't been seen by anyone other than my Father or I for the better part of 50 years so it's fun to share.
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