I believe Ken made 3 versions, the large majority being Floating #3.
Ken Armstrong would rebuild these to a higher output for about $100.
I have what's probably a unique one rebuilt as a single coil by one of the current Heritage team.
People bad mouthed the Floating #3 a lot. I firmly believe much of the criticism came from the urge to guild the lilly. The #3 is an excellent low output humbucker. It is very clean, almost acoustic sounding.