You could always send the photo in to PSA for their photo identification service, have them crack it out of the slab and re-holder it in one of their own which are much thinner and framable. Or else crack it out yourself.
My experience with photos is that the "pedigree" of the photo (i.e. being from the Culver collection, Sporting News archives, etc.) is neat, but does little for the value of the photo. The quality and content of the image is most important, along with the "Type," in determining collector value. With news photos especially, a little wear is expected, so having it graded by a company that typically grades comic books isn't going to weigh too heavily in a sports collector's eyes. If they want it slabbed, they will probably have it done by PSA to match the rest of their collection.
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