The BB is actually even worse. It's a proprietary Herse thing, which takes cartridge bearings of some sort. The threads are French, but in the absolute literal sense. I believe the right cup is left-hand threaded, for what it's worth! But who knows the diameter!! A guy asked me to machine him a replacement cup, pre-covid, but we never got the bike in the same place as the lathe so I could do the appropriate test-fitting. Maybe one day that will be possible again.