Most alterations to fine art are for the purpose of preservation not to increase the value of the piece. As far as if it increases the value of the art, I would say no. If the piece was in excellent shape with no preservation work it would bring more money than a piece that has been restored. That is hard to show examples of since art is one of a kind. In 300-400 years we may think that restoring high end cards so they don't disappear for ever is acceptable also.
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