How does this '52 Topps Wight get a Gray label?

Just curious about the "Gray Back" label this card has. I thought PSA only gave out the "Black Back" variation on the flips. The Wight card I own is a "White Back", will they give that a special label if I send it in? BTW, didn't realize this card was so rare. Thanks. Doug
'52 Bill Wight Gray Back
'52 Bill Wight Gray Back
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Comments
Isn't that a white back?
Looks like a White back to me...did PSA get it wrong?
Neil
<< <i>He just put up a scan of the reverse
Isn't that a white back? >>
For cards 131-190, the card stock is noticeably whiter--a more cream color compared to the gray featured on this card.