Originally Posted by
plonz
My mixte is lower-end but also has the cable guides on the right top tube. I figured this was common on mixtes with the brake bridge up top.
You are probably correct about the brake bridge on the seat stays. Your Mixte and the OP's both share that setup, and I think it would make running the rear brake cable outer a bit easier with the braze on cable guides on the right lateral tube.
For some reason searching mixte images doesn't show this for me, I'm glad you could show us yours.