Just looking at how the seat stays join well before they attach to the seattube and toptube, reminds me that nothing new is really new. It's hard to see in the picture of my 2003 Cannondale, but it used the same technique.



While this page might not help, these photos from the Wheelmen website might be give you some other old bikes to look at.
http://www.thewheelmen.org/sections/...pneumatic1.asp