Can anyone date the work? I figure mid-late sixties... The work itself isn't bad, clean but old. I'm not sure if bushings were even required then? Didn't they make them out of lead at the time? And didn't they just realize lead caused brain damage? Speaking of metals, the lugs look to be mounted on copper clad, or other wise coated aluminum, with some sort of tin bolt covers. The lugs look copper, but with brass set-screws. Whole lotta dis-simular metals going on from the manufacturer. Maybe this was in the height of fear over use of aluminum.
Other than the bushings, I dont see anything wrong with the workmanship, just equipment failure. If this is a 3 phase contactor, the only neutral there on the coil is id'ed.