Good morning Jaime,        You have a very rare machine. There were a few SA250 gas welders built in a large frame, the same as the Perkins diesel model. Then there were Canadian machines in the SA200 frame, but with the AC exciter sticking through the front panel. If you check the serial number, Lincoln will tell you the machine is a 48 model or some such. It is really a 90's model. The code number is on the front panel unless someone took it off. It is also stamped into the right side of the generator, facing front panel. You want to be careful because Lincoln used two exciter assemblies each using different bearings hence different armatures. Thanks,     weldersales