Hey guys and gals, we helped one of our local customers sell several Steinberger guitars and basses when their father passed a couple years ago. I have tried to research this model, and I just can't seem to nail down exactly what it is. What I know (at least I think so) is that it is the 4 string width neck, bolt on neck, wood body, no lined fretless 5 string. It has a serial number of N5907. I thought it was an XP series, but I'm not really sure. I really appreciate any insight. I do have more pictures if needed.