I just finished the Last Waltz, and it surely is a Ripper. I could swear that was his main bass during the last period of The Band, but don't quote me on that one.
Rick was Lakland's first poster child back in 1995. He was also playing a Gibson Les Paul signature bass a.k.a Jack Casady, and a custom made hollow body bass which he used on Letterman's show, just weekes before he passed away.