Found this compilation accidentally on YouTube. It's lost footage from a clinic he did and the bass he's using is a Jaydee Supernatural! Jaydee was pretty much put on the map thanks to Mark King of Level 42, and being this clip is around 1985, would be right around the time Level 42 broke in the charts. '85 is also right around the time that Jaco was bassless, and/or leaving his prized J basses in Washington Sq. park, sadly, due to his declining mental health. So I'm guessing the Jaydee he's playing is not his. (I haven't watched the whole clip, so maybe he addresses it?).
An interesting curiosity for Jaco fans to see though. He starts playing around 6:57 in.
https://www.youtube.com/watch?v=deDI0XwNdCg