Re: Info on Holdsworth Duncan?
If yours sounds like the JB, then that's what it is. It's like two JB screw coils. The pole pieces can make a huge difference in the tone of a pickup, so don't discount it as "just poles".
I don't know if there was ever a Holdsworth based on the 59N, but I do know that ever since I remember, the Holdsworth spec'd out same as the JB. So if you want to duplicate the pickup you've got there, the best way is to take two JB's and make a hybrid. Or you could pop the slugs, fill the holes, and re-tap them for screws. Then you'd have to get a metal spacer for that side as well.
I'm not saying NYK is wrong, but the pronounced mids are not the reason you're thinking it sounds like a JB. If you read it on the meter it'll be up around 16k, same as the JB. If it turns out to be around 8k, then I guess I'm wrong.