<< a 1979 Trek 938. Very nice bike, likely a Tim Isaac design. >>
> My memory is fading badly but "Tim Issac designs" would most likely be the fast back style low level seat post binder bolt. He introduced that style and it was similar to his designs he used on his opwn branded custom bikes prior to coming to Trek.
> This design looks like the earlier style, brought forward from the earliest days...
> Trying to recall when Tim Isaac arrived at Trek... I went to a sales meeting there right after he arrived and was out of their employment within a year or so after that.
> I bet John Thompson will recall all these details.
> Dale
I believe that Trek used both the fastback and more conventional seat stay detail from the very beginning. My '78 (by serial # date code) TX900 has the fastback stays. I believe that at least initially, the 700 and 300 series had "TREK" cast top eyes, and the 900 series had the fastback design. The very earliest catalogs certainly suggest this was the case.
http://www.vintage-trek.com/
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Wayne Bingham
Lovettsville, Virginia USA