I have an extra neck. It says "Precision" but it was off a p/j bass, and I believe this is more of a jazz neck. It feels slimmer, that's for sure. It measure 1.5 inches at the nut, and 2.5 inches at the heel. It's in great shape! Rosewood. Looks sharp.
When I first got the bass, it was horrible. I think it had been sitting, unplayed, for a very long time. I did a set up, and the only bad thing was a buzz on the second fret of the A string. I thought "oh crap what did I do?" But when I put the neck on the Thunderbird body, put on a set of chromes, and tuned it up, no more buzz. In fact, I could have the action ridiculously low (too low for my heavy fat fingers).
For sale for
80 shipped (Price drop!), with tuners. Or best offer. Or for an MXR Carbon Copy. Pay pal is fine.