^^^^ Photo is too low res to be sure (WW points for hectares of photo blackspace), but that MIGHT just be a T R E K seat stay cap from the pre-fastback era.
Re. that Karakoram, that's just painful to see. I'd be tempted to look into having a single S&S coupling installed, just to save the frame. (I suppose logistically you'd have to do the downtube as well.)