Re: Superjoint Ritual Pup
This is pure speculation, but I think Duncan made a dual rail pickup for Tony Iommi, which he never actually used, or used very little. I believe it was made for his Patrick Eggle guitars. The fact that the pickup has rails, and Tony's initials in the model number, makes me think that's probably what the pickup is.
As far as other info goes, if I recall correctly, it's a very hot pickup, in excess of 20k D.C. resistance. I seem to recall something about it being wound on two tele pickup bobbins too, so it's larger than your normal humbucker. My memory on this is hazy though, I could well be talking bollocks.