Roberto Clemente was already a seasoned pro nine seasons or so into his major league career when this photo pack was being sold in Pittsburgh and environs. The PSA 4 is due to the staining seen on the front, perhaps residue form a an old spilled Coke at the ballpark or some other natural disaster. The staining is mostly confined to the large lower border and the narrower upper right side border and doesn't affect the central image of Clemente.