I can tell you from personal experience that SGC won't grade a rebacked N172... They may have in the past but I had one rejected a few months ago.
I have a few skinned (not rebacked) OJs in my collection, graded A by SGC.
I don't like PSA for N172s (I think they look strange), but they seem to be more lenient about giving "Authentic" badging to both skinned and rebacked cards.
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