Not a complete hijack, we are still talking about Model Ones.
It was a single pickup bass to start with. The headstock was broken, the repair shop was above a music store that had the Model Ones in stock. It was 1979, I was more into expermental than traditional, and really liked the pickups.
Also while that bass was being repaired I bought a Ric, played it stereo, liked it so the Model Ones got wired stereo too. The neck pickup to a 2x15 solid state rig, and the bridge to a 1x15 tube rig.