Starting a new bump to the thread (from M-theory) concerning the frame with fastback seat cluster...now I've taken some slightly better detail shots of this frame/fork and posted them to this Velospace site:
Velospace limits the size/resolution, so they aren't as great as they could be, but you get the idea. This bike seems to be an American or British build from about 1980, and seems to be all 531 and is a 55x55, takes a 27.2 post. It has a BSC BB shell and 2 matching serial numbers on the BB shell and fork steerer: 2318141.
Any help ID-ing it is appreciated. Pretty sure it's NOT Bruce Gordon or Trek...