Wow. That is way out of spec. I think what has been demonstrated here is that old system bottom brackets were remarkably adaptable. And your spindle survived from late 60s to 2018. With a track record like that replace with a new one just like the old one. They are not that hard to find and will be a lot cheaper than anything new. TA was finished a bit better than other bearings from Verot et Perrin but you are allowed to swap in a Stronglight or Nervar.