Jason Giambi Oakland Athletics 1998 Donruss Rookies and Stars Autographed Card - Nice Autograph. This item comes with a certificate of authenticity from Autograph-Sports. Autographed. Comes fully certified with a Athletic Promotional Events certificate of authenticity. . If a product is unsigned or non game-used, a hologram will not be included. Jason Giambi memorabilia. Oakland Athletics memorabilia.