NBC Autoweld 2 Restoration
Long story short this welder was used by the House Of Flying Spanners for several builds, when Jez upgraded to 3-phase I bought this unit from him and it's proven to be a very robust unit.
We don't know when exactly it was manufactured, estimates seem to be early 1970's. This means it's all done with big chunky transformers, not electronics, so should be bulletproof and easy to repair (and has proven to be so).
Here it is facing off against a modern MTA unit (which is still a decent welder) - you can see how huge the wire feed motor is in comparison: