This must be from the first Weather Report tour with Jaco in the band. Here is a pretty decent audience recording of Jaco taking a solo in front of the Wayne Shorter tune "Lusitanos".
You can hear some classic Jaco-isms in his solo - pentatonic runs in odd note groupings, playing all the color tones and extensions, and of course, the tone and the groove. Oh the groove.
This was at the Paramount West Theatre in Seattle on May 27th, in 1976, so Jaco was just starting to be heard by the world.