This Size 6 ASEA model EG 630-1, motor starter/contactor is a takeout from a huge DC power supply that I bought on eBay and parted out. I believe that that power supply was used very little and the contactor was used very little. I am providing pictures of the contacts themselves, shown to a very high resolution. It is apparent that the wear on contacts is minimal. this power supply was used in a government research lab and mostly sat on shelf, unused.
Size 6, 540A max, 400 HP max horsepower. See pictures for details. Model EG 630-1.