Jim Tatum Signed Louisville Slugger Bat - "First Ever Rockies Grand Slam" | JSA Authenticated This is one of the most historically unique pieces of Colorado Rockies memorabilia you'll ever find. This Louisville Slugger baseball bat has been hand-signed by Jim Tatum; the player who hit the first-ever grand slam in Colorado Rockies franchise history -- an extraordinary footnote in the birth of baseball in Denver. Whether you're a die-hard Rockies fan or a collector of rare; one-of-a-kind historical pieces; this bat stands alone. Authenticated by James Spence Authentication (JSA) with a Certificate of Authenticity. Highlights Hand-signed by Jim Tatum; Colorado Rockies infielder Inscribed to commemorate the first-ever grand slam in Colorado Rockies history Full-size Louisville Slugger baseball bat A rare and historically significant piece of Rockies franchise history Authenticated by James Spence Authentication (JSA) with COA Authentication Authenticated by James Spence Authentication (JSA); one of the most respected third-party authentication services in sports memorabilia. The COA includes a unique serial number for verification.