I'm late to the party again, but perhaps I can offer some information...
Originally Posted by
Sir_Name
Thank you. To my knowledge Klein didn't have production offerings until 1980 so this one would have almost certainly been made specifically for someone (I think...). '75/76 would have been the time when Gary Klein was building near MIT. I need to get back to my history lessons on these, I had a reading-marathon around the end of July when I purchased this, but some of the details are already starting to drift away...
Frames were in production prior to the 1980s. Full colour advertisements started appearing in Bicycling in very early 1979. By this point the derailleur cable routing had already been redesigned to go under the bottom bracket shell. There was also a B&W advertisemnet in the late 1970s, though I can't recall its chronological relationship to the colour advertisement.
Originally Posted by
JohnDThompson
...What's the bottom bracket? Phil Wood?
Originally Posted by
Sir_Name
The BB is not a Phil to my knowledge. The bearings are FAFNIR 203pp which appears to be a standard bearing (were these used by Phil?? I'm not familiar with his/their components in any real way). The BB spindle is interesting, and not Campagnolo from what I can tell....
The bottom bracket was a proprietary design based around a Dura-Ace spindle.
Originally Posted by
Drillium Dude
Those dropouts, if nothing else, certainly are different from the early production Kleins...
The dropouts appear to be the same as those appearing in the early Klein advertisements.
Originally Posted by
Sir_Name
...The rear DOs are spaced at ~120.08mm where it counts...
This another piece of concrete dating evidence, as Klein switched to 6 speed spacing for 1978. From what I've seen, the frame should be pre 1978, though I can't say by how much. I'll check back through my mid-1970s literature and see if I can find anything else.