That will be a welding set that would last a lifetime, which would probably not be long thanks to the heart attack trying to move it.
Perhaps we should have a 'guess the winning bid' I will go at £120.11p
Quasi arc were great welders, I used to use one just like it, on the 100 volt setting it will give you a nice little tingle when you put the rod in, just the thing to liven you up in the morning!.
As i recall it will be single phase but at 380 / 415 volts, we used to run them from 2 phases of a 3 phase socket, still dims the lights when you switch them on