If the split corner had one side fold over and stay folded over for some time it could end up like that. And a clumsy attempt at flattening it could cause the pull of the nicer half. The thinner corner would wear more easily than a full thickness corner too.
But the lack of much wear to the other three corners makes it very weird. I'd really love to see the way the card had been originally stored. Perhaps in a part of a box that exposed one corner only? If so, there should be others from the same source with 3 nice corners and one more worn one.
Steve B
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