A former employee of the Gibson Nashville plant has a "Where are they now?" thread on the Les Paul Forum. I asked him if he remembered the 20/20 bass....
Re: Where are they now...
Quote Originally Posted by Grog
Randy, Do you recall any info on the Gibson 20/20 Bass? Ned Steinberger designed it shortly after Gibson acquired his company. They were produced in low numbers in 1987. We think somewhere between 50 to 100 basses were sold. Being somewhat Fugly, they didn’t really sell well, but it was an interesting piece of Gibson’s history of making basses.
Yes I do remember the 20/20. Barely. They were so un-impressive I believe 100 being sold may be too high.
IMO, they weren't much more than a "flavor of the month" before they disappeared.