Below is an image of the GB next to a normal WB...to me there is a discernible difference. The GB appears consistent with my lone GB I have in my collection. My GB came as part of a lot I purchased from this same seller of the 52 189 GB PSA 1.5. This seller sells mainly modern, but offers vintage through consignment. It is possible that their consignor realized they were mistakenly including 52 grey back cards in their lots and started having them graded to offer as singles.
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