A winder for whom I've worked had a model almost like that, but with two (Alnico) bars instead of 3 ferrite bars. One of the rails humbuckers was a 7.5k model. The other was around 11k. Both could be wired separately or in series. But there were many other possibilities: each rail pickup in series but in parallel with the other, outer coils or inner coils in series or in parallel with each other, one humbucker in parallel, the other in series, both in parallel wired in parallel... non limitative list and a whole palet of tones to explore in only "one" pickup. ;-)