This was from my second batch (I think) of 5 strings and my first 24 fret version. Probably around 1990. It may also be the first time we used our current 19mm string spacing and neck width. We called these, in retrospect, "Longhorns". The tip of the horns are the same as the would be on a J-bass, with deeper cutaways. We then shortened the treble horn on the next batch which resulted in the body shape we have used ever since.
The description on the Low End site is incorrect in that Tom Anderson never made any 5 string parts for me or anyone else.
I have never been able to intonate with anything other than a strobe tuner. I do not find any significant difference in tuning to the open string or the 12th fret harmonic. Also very important to play the fretting note with normal playing pressure.