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Jason Lwas he public about his collection?
Perhaps he didn't share it much, or wasn't the same detail-oriented examiner of card variations as was someone like Nagy
going back in time to the era of collecting when the legends you speak of were in their collecting prime, there were some differences that could easily explain how these variations went unnoticed:
1) information was harder to obtain and travelled slower, pre-internet
2) money wasn't chasing these cards, and therefore, variations likely went unnoticed (and unrewarded with premium valuations) by many collectors that weren't motivated by profit and product differentiation.