PSA says it's graded 3 of them. No photos there, and I can't find an image anywhere else.
This is interesting, though, because I'm not sure those should exist. These "cards" are pages from little booklets; the reason they all have mismatched backs is because Mantle's "back" would have been printed across from the image, not on the back of it. (I would argue that, as things hand-cut from published books, these are no more cards than newspaper clippings are cards, but no one asked me.)
So if there *is* a Mantle front/back combo, it could not have been cut from an actual, correctly printed Tiddlers book.
It looks like some people have been making their own reprints with matched front/back, as seen in this Arnold Palmer:
https://www.ebay.com/itm/186326984656