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petei guess it depends on how big or bad the stamp is and if its a big name or not...i have a cy young card that has a small pen mark on the back and im sending it to SGC so i can have it placed into a holder, at least for the authentication sake of it if i ever resell it...
as a matter of fact, i know this is your post but along the same lines ....but does SGC have a standard grade if there are marks of any kind??? does it automatically get a 20/1.5 ??? unlike PSA they have the qualifier grades...
pete-