jsq
Given the fact that some of these cards are already over 100 years old and survived that long without being encapsulated by any grading company, I think its safe to say that they will last a long time after being slabbed.
As far as sun exposure, well I wouldn't suggest letting cards sit in direct sunlight. Can't really say what would happen since I've never tried it. I have seen some Cracker Jacks that were left sitting in an antique store front window for years. They looked more like leather than cardboard/paper.
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