NOTE: This description has been modified from the printed catalog. The two signed SI pages are mounted back to back on heavy card stock. The Maris page has a full photo LOA from JSA. The Aaron page (attached to the back) has been deemed secretarial by JSA.
This April 24, 1967 Sports Illustrated page is in low-grade condition due to heavy wear and soiling but does feature a bold signature of ("9") quality. The front shows Maris rounding first base and is signed by the (then) Cardinal in blue pen. Full photo LOA from JSA.