Bats aren't my area of expertise, so I can't authenticate it, but I do have 2 thoughts about it:

1) the presence of the LOUISVILLE SLUGGER line below Jackson's name would place it pre-1990. In 1990 the third space was blank, and starting in 1991 the name of the player's team was placed there. Starting then I believe that the company name only showed up there on Minor League issued bats.

2) I don't recall the exact season it started, but sometime during Bo's career was when LS began using gold and silver print on dark bats...before that they didn't. That means it's possible that this bat was made earlier in Bo's career.

Hope this helps, and if any of the real bat gurus on the site can clarify or, if necessary, correct my comments, that's fine.

Dave Miedema