Check the google image gallery for Rabeneick Campagnolo. Most bikes that show have sidepulls. I found two with your style binder bolt and centrepull. One had a braze-on to mount the hanger, the other had a seat collar that could have been put there by the owner with hanger attached to bolt. There were also standup cable stops that attached to the back plate of the brake. Have not seen one of those in a dogs age but they existed at least in Mafac and DiaCompe.