Ok, so I am looking around at the local shop that I dig. Come across a nice looking vintage J bass. Tag says 72 and they want $2200 for. Not that I am interested in the purchase, but I was playing it a bit (sweet) but I noticed the neck was a 4 bolt. Now my understanding is that the J bass was 3 bolt up untill 78 or so. So what do you guys think? I brought it to the attention of one of the guys, and never got an answer. Interesting!