I would think there are at best a handful of cards post WW2 that would ever be considered for restoration.
They are just too plentiful for the most part. Even the 52 Mantle is available to anyone who wants to pay the price. There are at least 22 on Ebay right now.
Even pre war, there are only a few cards that would be "restorable" and I doubt they would be able to slip them by PSA or SGC or Beckett due to the high profile of the card.
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