Miller 320 AB/P with an external water cooler and a foot pedal, it's a 1972.
Works great, I've had it about 10 years now. All analog, weighs a ton with real copper windings (ok, not a ton but probably over 500 lbs). 60% duty cycle at 200 amps, 100% duty cycle at 150 amps. So 1/8" steel all day long without stopping, 3/16" depends on the weld type but anywhere from continuous to about 60%. Can put out about 250 amps at full power. It uses older wave technology and isn't quite as easy to set up for different materials as the new stuff, but once you learn the settings it's pretty easy.
Came with all the accessories, a few extra regulators, some stick welding electrodes and an old PowCon plasma cutter for $500.
