These four (4) balls will make Birdland buffs run, not walk, to Bid-land. The team signed balls are from 1987 (26 sigs), 1988 (30), 1989 (29) and 1991 (26). Cal Ripken Jr.'s valuable marker is on all of them, and graces the SS of the '87 ball -- when he was player-manager before giving way to Frank Robinson 6 games into the '88 season; Robby's sig is on the SS of the other balls. Overall EX-MT.