Preservation wise a slab is NOT the safest method. If displaying it should be framed behind museum glass done by professionals (not Michaels). If storing it, it should be stored in a maylar sleeve, then between acid free boards in an archival storage box. Sure PSA can render an opinion but you could also talk with autograph and art experts that can give you value and access if the photo is vintage or not.
PSA isn't the end all be all.
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