A listen to the Rhino Studio demo version [one of the extras on the Pornography remastered CD release] is recommended; the bassline is much more obvious!
Verse is GBC.............GCB............. with an occasional DCB thrown in for variety and a ringing octave at the end of every couplet, which doesn't show up on the demo and was obviously added later. Oh, and there's a Bflat for the "just like the old days" bit, and the "Hundred years..." section is Gflat.
That's from a quick listen/play, so I'll throw in an accuracy disclaimer, but I'm fairly confident
