The lug cracked on the outside of the cutout, it can be ground off. Really the brazing just failed. I compared it to a Schwinn Tempo yesterday and I'm even more convinced that it is a Circuit because of the 27.2mm seatpost and aero fork. Hans Schnieder told me that he would have to replace the whole tube for it to be fixed properly, which would be at least $200.

So, in anyone's opinion, is this frame worth spending a couple hundred dollars on to have it repaired?

It fits me like a glove; it's fast and comfortable. What should I do?