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runscottRestoration is controversial and has a big effect on prices for all paper items, including comics, rare books and other paper documents. While restoration is more acceptable for rare books than the other items, it has a major effect on value.
I think that restoration is most controversial with cards because it is used so often in a deceptive way - "trimming" has given all forms of restoration a bad rap. I don't have a real problem with the Darbys restorations, but I think it would have been better to create high-quality reproductions instead, leaving the originals "as is". JMO.