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PASJDI mentioned this at the end of the thread on the allegedly restored but slabbed Cobb, and for those interested in reading a 1996 article on restoration that may or may not be of concern today (although I would guess techniques if anything have improved with technology, not the reverse), I have attempted to upload it in pdf format to the following URL from which hopefully you can download it:
members.aol.com/pspa123/articles/restoration
I post this for informational purposes only and make no judgments about the extent to which altered cards are being slabbed by the grading services.