It's a Hipshot. It was on the bass when I got it, and I'm liking it more and more over time. The 2015 has not been chromed out, which means the d-tuner is black, with the later style Y handles instead of clovers. That makes it easier, since you have to talk to Hipshot and be specific about what you are ordering to get clovers that fit a Thunderbird headstock. As far as I can tell, the d-tuner was a direct fit for the 2015. Hipshot tuners required some added holes in the 1991 headstock, because the design of the original tuners on that one was different from the current design. It's the location of the small screw that goes into the back of the headstock that changed sometime or another. More information than you asked for, but I figure it's good to have depending on the year of 'Bird you are thinking about putting a d-tuner on, and what you want the handles to look like.