Trek cable stop question
 

What’s going on with the downtube cable stops on this 79 510? I emailed the seller for better pics. I thought this had clamp on stops, it’s either brazed on stops or magic.
https://cimg2.ibsrv.net/gimg/bikefor...2fa89d527.jpeg
https://cimg3.ibsrv.net/gimg/bikefor...f35555956.jpeg

I just got a better pic, they’re braze on stops. Is this a normal thing on these?
https://cimg6.ibsrv.net/gimg/bikefor...4bca5a8ea.jpeg

According to this it was a option.

https://www.vintage-trek.com/Trek_galleryDM510.htm

The presence of these stops shows that the maker assumed the bike would have bar-end or stem-mounted shifters, i,e. not mounted on the down tube.

My ‘84 760 has an extra braze on front derailleur mount, JohnDThompson confirmed as an available option.

As brian3069 notes, these were an added-cost option at the time.

The Vintage Trek site has a "Price Lists" section- braze on cable guides and stops were $3.00 a pop.

https://www.vintage-trek.com/TrekPriceLists.htm

Yep, a guy I worked with ordered them for his new 510 frameset. Years later I had a local guy add them to my own used 510.