Thanks guys. One thing I'm noticing as I look through my 1974's is a lot of them have staining similar to the McCovey card on the back. I don't remember noticing this as much, when I last looked at these decades ago. I wonder if this is from finger oils reacting with the paper over 40+ years rather than a packaging stain? Or maybe it was accelerated by the plastic sleeve I've had it in for the past 25 years.
The only thing PSA mentions for staining is "wax stains." Does it matter if the stain is due to something else like finger oils, or more just about how much of the card face the stain covers and how dark it is, regardless of what caused the stain?
If it is due to finger oils, I guess it might be a good idea, if you have valuable 1974's, to wear some nitrile gloves when handling them as naked cards.
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