I don't know. I haven't found any other blue box 1963 Topps cards while I have been looking for them. If this is the natural product of fading and the same fading occurred three separate times for these Mantles cards, I assumed I would find other cards of common players that had similarly faded. But even though I've found plenty of faded cards in general, I have only found these three that look like this, and they are of the same card and player.
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