It's very rare can't find any information on it at all. Plays great< kneck doesn't move at all. I play 50-110 strings and it's always in tune. Best bass for staying in tune I have ever owned. Got it set up last year, first time in 10 years. The tech set the intonation that was it, he said everything was fine. Any info would be great
but yeah it's good enough to have as backup...