I have '79 514 which has braze on TT cable guides (unlike the ebay bike), and an '82 614 which also has them. In the 1970's, Trek was much more likely to add/delete brase-ons for racks, bottle holders, etc, so it is possible that they were omitted for this bike. John Thompson worked there for a number of years in the 80's, but this bike may preceed him. Never-the-less, he may have better insight.