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davidcyclebackAs proofs are often handcut and have printer's writing on them, a 1-10 grade may or may not be appropriate. For example, if the writing was put there by the printers as part of the proofing process, does the grader deduct grades for the writing? If the borders are unevenly handcut, how does the grader grade that? The uneven cut is an original part of the proof yet may be aesthetically deserving of a grade 1 Poor. If one gets a proof authenticated without grade, that should be sufficient-- and a learned collector would understand that a proof may not receive a 1-10 grade as it's a production item not a finished card.
It's not unlike a PSA/DNA encapsulated Joe DiMaggio autographed index card. Some collectors might have PSA/DNA give the card a 1-10 grade along with the authentic designation, but most collectors will find nothing amiss if it only has the AUTH. The collectors' prime concern is authenticity. If the sig has been graded AUTH only, potential buyers will be trusting of the seller's description of condition especially when a nice image accompanies.