is that 35mm x 1mm with RH threading AND LH threading (which would be Swiss and the LH would be on DS) or can you not determine what direction the threading is for the DS because the cup is brazed in place? if it turns out to be RH threading on both sides then this is French and so the frame is more likely French as well but not 100% certain since some Swiss (and some Belgian and Spanish, even the occasional Austrian) also used this standard but not nearly as many compared to FR. Have the framebuilder study the BB carefully and make sure it's really brazed in as well as what direction the thread is /was cut...SOMEtimes damaged threading was repaired by building up with bronze and re-cutting the threads...that 74 Campy spindle explains why the BB looks so weird, but not what the PO was thinking! Maybe he had some bizarre hip problem that a lopsided "Q-factor" compensated for...or he certainly could develop one if he rode the bike like that!