MLB Collectibles > Oakland Athletics > Baseballs 1973 Oakland A's Athletics World Series Champs Team Signed Baseball JSA COA - Autographed Baseballs 1989 Oakland A’s World Series Champs Team Signed Baseball 28 Sigs JSA COA - Autographed Baseballs Jacob Wilson Oakland Athletics Autographed Baseball with Multiple MLB Debut Inscriptions - Limited Edition of 25 - Autographed Baseballs Jim "Catfish" Hunter Oakland Athletics Autographed Baseball – PSA AN81047 - Autographed Baseballs Nick Kurtz Oakland Athletics Autographed Baseball - Autographed College Baseballs Billy Martin PSA DNA Autograph Oakland A's Billy Ball Signed Baseball - Autographed Baseballs More Oakland Athletics Autographed Baseballs