Shop › Tom Seaver Signed Official National League Baseball. JSA Image 1 of 3 Image 2 of 3 Image 3 of 3 Tom Seaver Signed Official National League Baseball. JSA $200.00 Tom Seaver Signed Official National League Baseball. JSA certificate of authenticity. Housed in a clear acrylic cube. Purchase Added! Tom Seaver Signed Official National League Baseball. JSA certificate of authenticity. Housed in a clear acrylic cube. ask a question You Might Also Like Goose Gossage "HOF 2008" Signed Color Photo. Steiner Sticker $60.00 Willie Mays Signed Official National League Baseball. JSA $400.00 Stan Musial Signed OML Baseball. 20 Stat Inscriptions. ReggieJackson. Ltd 1000. Beckett $975.00 Nolan Ryan Signed "HOF '99" Official Major League Baseball. Nolan Ryan Sticker $250.00 Larry Doby "Lawrence Eugene Doby" Signed Baseball. JSA $400.00