[drc]

It looks as if the sticker goes over the edge of a top loader, so the card is sort of sealed. Some big dealers do that as a form of inventory cataloging. I've gotten items like that where the sticker included a serial number, I assume for their records. Mike Wheat use to do that type of thing. They my also think it important and self-protecting for returns-- which I appreciate.

It may not be used as "grading" as we know it, but as a label for items they sell.