Are you positive that was signed in Sharpie? I have seen some sharpie sigs bleed into older cards over the course of many years, but never seen one fade completely away. Even the ones I've seen that were left in direct light (hanging in a classroom for severla years) simply turned a muddled greyish-blue, but are still quite visible. That Drysdale seems more likely to have been signed in some type of water-based ink like a Flair pen.
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